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1
Lin, Jia Horng, Chen Hung Huang, Yu Chun Chuang, Ying Huei Shih, Ching Wen Lin et Ching Wen Lou. « Property Evaluation of Sound-Absorbent Nonwoven Fabrics Made of Polypropylene Nonwoven Selvages ». Advanced Materials Research 627 (décembre 2012) : 855–58. http://dx.doi.org/10.4028/www.scientific.net/amr.627.855.
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The rapid development of textile industry at the beginning of the Industrial Revolution results in the invention of synthetic fibers. As synthetic fibers cannot be decomposed naturally, significant textile waste is thus created. Selvages, which make up the majority of our total garbage output, have a low value and thus are usually sold cheaply or outsourced as textile waste. This study aims to recycle and reclaim the nonwoven selvages which are discarded by the textile industry. The recycled polypropylene (PP) selvages, serving as a packing material, and 6 denier PP staple fibers are made into the recycled PP nonwoven fabrics. The resulting nonwoven fabrics are subsequently tested in terms of maximum tensile breaking strength, tearing strength, surface observation, thickness measurement and sound absorption coefficient.
2
Racho, Patcharin, Pinitta Phalathip et Warutai Dejtanon. « Modified Synthetic Fibers a Treatment for Heavy Metal Removal in Aqueous ». Materials Science Forum 890 (mars 2017) : 133–36. http://dx.doi.org/10.4028/www.scientific.net/msf.890.133.
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In this study was evaluated a performance of chemically modified synthesis fiber for the heavy metal treatment. Four fibers sampled from textile industry were evaluated in this study including of polyester, nylon, rayon and polyester/cotton. The graft copolymerization is the first step of modification process using acrylic acid with and without a surfactant. Then, amino chelating group was prepared via soaked in ethylenediamine solution. The grafting percentage was found in about 30-54% and 12-138% respectively without and with a surfactant conditions, respectively.Since, 3 M of acrylic acid 0.1 g of BPO neither, a polyester/cotton fibers nor 4 M acrylic acid. Overall results showed that the amino chelating fibers had higher lead and hexavalent chromium removal efficiencies than non modified fibers. These indicated the chemically modified fibers that functionalized with acrylic acid and ethylenediamine had capable to improve to an adsorption capacity. The modified nylon fibers had the highest adsorption capacity within 48 mg/g for Pb2+ and Cr6+.
3
Zuliahani, A., H. D. Rozman et Abdul Rahman Rozyanty. « Influence of Montmorillonite Treated with Cetyl Trimethyl Ammonium Bromide Addition in Epoxy-Kenaf Composites ». Applied Mechanics and Materials 754-755 (avril 2015) : 235–39. http://dx.doi.org/10.4028/www.scientific.net/amm.754-755.235.
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The use of natural fiber as reinforcement in polymer composites has gained importance recently due to environmental concern and its abundance availability from agricultural crops and wood industry [1]. Many advantages offered by natural fibers over synthetic fibers include low density, greater deformability, low cost per unit volume, recyclability and biodegradability [2-3]. In addition, the mechanical properties of natural fibers such as flax, hemp, jute, sisal and kenaf are comparable with glass fiber in respect of strength and modulus [4]. Hence, many studies have been carried out to replace the synthetic fiber for composite preparation.
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Hanumantharao et Rao. « Multi-Functional Electrospun Nanofibers from Polymer Blends for Scaffold Tissue Engineering ». Fibers 7, no 7 (19 juillet 2019) : 66. http://dx.doi.org/10.3390/fib7070066.
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Electrospinning and polymer blending have been the focus of research and the industry for their versatility, scalability, and potential applications across many different fields. In tissue engineering, nanofiber scaffolds composed of natural fibers, synthetic fibers, or a mixture of both have been reported. This review reports recent advances in polymer blended scaffolds for tissue engineering and the fabrication of functional scaffolds by electrospinning. A brief theory of electrospinning and the general setup as well as modifications used are presented. Polymer blends, including blends with natural polymers, synthetic polymers, mixture of natural and synthetic polymers, and nanofiller systems, are discussed in detail and reviewed.
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Ahmed, Waleed, Fady Alnajjar, Essam Zaneldin, Ali H. Al-Marzouqi, Munkhjargal Gochoo et Sumayya Khalid. « Implementing FDM 3D Printing Strategies Using Natural Fibers to Produce Biomass Composite ». Materials 13, no 18 (13 septembre 2020) : 4065. http://dx.doi.org/10.3390/ma13184065.
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Current environmental concerns have led to a search of more environmentally friendly manufacturing methods; thus, natural fibers have gained attention in the 3D printing industry to be used as bio-filters along with thermoplastics. The utilization of natural fibers is very convenient as they are easily available, cost-effective, eco-friendly, and biodegradable. Using natural fibers rather than synthetic fibers in the production of the 3D printing filaments will reduce gas emissions associated with the production of the synthetic fibers that would add to the current pollution problem. As a matter of fact, natural fibers have a reinforcing effect on plastics. This review analyzes how the properties of the different polymers vary when natural fibers processed to produce filaments for 3D Printing are added. The results of using natural fibers for 3D Printing are presented in this study and appeared to be satisfactory, while a few studies have reported some issues.
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Moreira, T. M., et Emília Satoshi Miyamaru Seo. « Corn Leaf Fibers Preparation and Characterization for Composite Obtention ». Materials Science Forum 881 (novembre 2016) : 271–76. http://dx.doi.org/10.4028/www.scientific.net/msf.881.271.
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There is a global trend in seeking plant fibers to replace the synthetic fibers to obtain reinforced composites, aiming the use of renewable resources. In this context, this paper objective is to develop the process of corn leaf fibers preparations , characterize and adapt them for applications in the construction industry. Corn leaves were dried in room temperature, treated by mercerising (chemical process of attack on the fiber surface making it rough); then neutralized with acid solution and washed in running water. The characterization of the corn leaf fibers was performed by X-ray diffraction, X-ray fluorescence Spectrometry, Scanning Electron Microscopy, Thermogravimetry, specific mass and Fourier Transform Infrared Spectrometry. The mercerizing treatment was effective, because the corn fibers have similar characteristics to synthetic fibers, leading to a possibility of new technological uses, besides the application in gas pipe manufacturing
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Glyuzitskiy, K. К., et A. V. Korenevskaya. « THE RELATIONSHIP BETWEEN THE PRICE OF PETROLEUM PRODUCTS AND THE COMPETITIVENESS OF TEXTILE ENTERPRISES IN RUSSIA ». Scientific Journal ECONOMIC SYSTEMS 1, no 181 (2021) : 117–25. http://dx.doi.org/10.29030/2309-2076-2021-14-2-117-125.
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The article discusses trends in the textile industry, the pace and direction of use of synthetic fabric, key factors affecting the competitiveness of textile enterprises specializing in synthetic fibers. The necessary components are identified for the effective functioning and rapid entry into the world market of competitive enterprises in the textile industry of Russia. The paper addresses the problems of volatility of crude oil and the related instability in the price policy of synthetic fabric. The author concludes that it is necessary to actively stimulate and develop textile enterprises, considering the change in the oil market in 2020, as well as the current expansion of the use of synthetic fabrics.
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Cao, Zhen Yu, Feng Zhao et Xi Yan Li. « Applications of Dyes in Material Science Research ». Materials Science Forum 575-578 (avril 2008) : 1451–54. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.1451.
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Dyes are colored organic compounds that are used to pigment fiber or other materials. Dyes are mainly calssified into natural and synthetic dyes in terms of the origin. Natural dyes include animal dyes, plant dyes and mineral dyes with such defects as incomplete chromatogram, inconvenient use and color fading, and thus have been gradually eliminated. In 1856, the 18-year-old young British scientist Perkin successfully invented the world's first synthetic dyes. He built his own factory and industrialized synthetic dye production. Over 100 years since then, dye industry has undergone rapid development, and by 2001 synthetic dyes already have been up to nearly 10,000 varieties. In 2004, the output of total dyes in the world has reached 900,000 tons. Synthetic dyes are used comprehensively, not only to dye synthetic fibers, but also natural fibesr, fur, leather and man-made fibers.
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Travis, Anthony Stewart. « First Steps : Synthetic Ammonia in the United States ». Substantia 5, no 2 (9 septembre 2021) : 55–77. http://dx.doi.org/10.36253/substantia-1181.
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The synthetic ammonia industry, originally based on Fritz Haber's 1909 invention of a catalytic high-pressure method as scaled up by Carl Bosch at BASF, grew globally in the years following World War I, based on the processes of Brunner, Mond & Co. (Britain), Luigi Casale (Italy), Georges Claude (France), and Giacomo Fauser (Italy). The ammonia was mainly converted into ammonium sulphate fertilizer. There was less impetus in the United States for taking up these developments, because America relied on ammonium sulphate from its by-product coke ovens, sodium nitrate (Chilean nitrate) from South America, ammonia from coal gas works, and calcium cyanamide as manufactured by the American Cyanamid Company. Even when a synthetic ammonia industry started up in the United States, it was on a smaller scale than in Europe. However there emerged just before the Wall Street Crash two major producers of synthetic ammonia, Allied Chemical and Du Pont. This article presents a historical reconstruction of the early synthetic ammonia industry in the United States focusing on the 1920s, paying particular attention to Du Pont's success, which relied on the ammonia process of Casale. Standard accounts suggest that Du Pont acquired Casale technology as the result of a straightforward business acquisition. However, the situation, as shown here, was far more complex. Du Pont had to engage in aggresive litigation in order to acquire rights to the Casale process in 1927.
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Donatelli, Antonio, Patrizia Aversa, Roberto Terzi, Tommaso Marcianò, Luca Laghi, Giulia De Aloysio, Wanda Arena et Vincenza A. M. Luprano. « Influence of Carding and Pressing on Hygrothermal Properties and Fire Reaction of Hemp Fiber Nonwoven Mats ». Advances in Sciences and Engineering 11, no 2 (15 décembre 2019) : 78–89. http://dx.doi.org/10.32732/ase.2019.11.2.78.
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This article depicts the effect of carding and pressing on hygrothermal properties of hemp fibers nonwoven mats, trying to understand if their implementation can improve their behavior when employed as insulation materials in buildings. Hemp fibers belonging to Cannabis Sativa species and coming from local area (Apulia - Italy) were examined, then samples of carded and pressed hemp fibers nonwoven mats were prepared. According to European standards, the thermal conductivity, the vapor permeability and the fire reaction of hemp fibers samples were measured. Results were compared to each other and with those of a commercial nonwoven mat made with hemp (90 wt. %) and synthetic fibers (10 wt. %), used as reference. We observed that carded and pressed hemp fibers were characterized by a lower thermal conductivity when compared to unprocessed hemp fibers, likely because the removing of wood elements. On the other hand, not processed hemp fibers show higher breathability when compared to carded and pressed ones, as well as with respect to the commercial nonwoven mat. Moreover, it was proved that the absence of synthetic commingled fibers in hemp fibers allows a better behavior in fire reaction. At last, the improvement in terms of insulation properties of a hollow brick when filled with hemp fibers was verified, by comparing the thermal conductivities of an empty and a filled hollow brick; as expected, the filled hollow brick shows a lower thermal conductivity, underlining the effectiveness of hemp fibers as insulation material.
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Urdanpilleta, Marta, Itsaso Leceta, Pedro Guerrero et Koro de la Caba. « Sustainable Sheep Wool/Soy Protein Biocomposites for Sound Absorption ». Polymers 14, no 23 (1 décembre 2022) : 5231. http://dx.doi.org/10.3390/polym14235231.
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The wool fibers of the Latxa sheep breed were combined with a soy protein isolate (SPI) matrix to develop sustainable biocomposites with acoustic properties, adding value to Latxa sheep wool, which is currently considered a residue. Samples with 7, 10, 15, and 20 wt % wool were prepared by freeze drying in order to develop porous structures, as shown by SEM analysis. Additionally, XRD analysis provided the evidence of a change toward a more amorphous structure with the incorporation of wool fibers due to the interactions between the soy protein and keratin present in wool fibers, as shown by the relative intensity changes in the FTIR bands. The biocomposites were analyzed in a Kundt’s tube to obtain their sound absorption coefficient at normal incidence. The results showed an acoustic absorption coefficient that well-surpassed 0.9 for frequencies above 1000 Hz. This performance is comparable to that of the conventional synthetic materials present in the market and, thus, sheep wool/SPI biocomposites are suitable to be used as acoustic absorbers in the building industry, highlighting the potential of replacing not only synthetic fibers but also synthetic polymers, with natural materials to enhance the sustainability of the building sector.
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Kavitha, V., et Aparna G. « A Review on Banana Fiber and Its Properties ». Asian Journal of Pharmaceutical Research and Development 9, no 3 (15 juin 2021) : 118–21. http://dx.doi.org/10.22270/ajprd.v9i3.956.
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There are many types of natural fiber including hemp, flax, jute, wood fiber, rice husks, straw wheat, oats, bagasse, barley, grass reeds, banana fiber, oil palm empty fruit bunch, coir, sisal, cotton, kenaf, ramie, water pennywort, paper-mulberry, kapok, abaca, pineapple leaf fiber. The production of banana in India is 13.5 million tons per annual. Banana forming generates more quantity of biomass which goes as waste. The above ground parts like pseudo-stem and peduncle are the major source of fiber. Banana fiber used as a raw material in industry for production of papers, tea bags, currency and reinforced as a polymer composite. Natural fiber is used as an alternative resource to synthetic fibers as well as reinforcement for polymer composite materials and the manufacturing is inexpensive, renewable and environment friendly. Natural fibers have low cost, low density and low durability as compare to synthetic fibers but with the help of fiber treatments, mechanical properties of natural fibers are improved. In this paper, banana fibers are compared through their applications, use and properties and thus it is concluded that the banana fibers provide better chemical composition and properties.
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Tholibon, Dulina, Izdihar Tharazi, Abu Bakar Sulong, Norhamidi Muhamad, Nur Farhani Ismail, Mohd Khairul Fadzly Md Radzi, Nabilah Afiqah Mohd Radzuan et David Hui. « Kenaf Fiber Composites : A Review on Synthetic and Biodegradable Polymer Matrix ». Jurnal Kejuruteraan 31, no 1 (30 avril 2019) : 65–76. http://dx.doi.org/10.17576/jkukm-2019-31(1)-08.
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This review paper deals with the previous and current works published on the kenaf fiber composites. Kenaf is grown commercially in South East Asia country and widely used in the construction and infrastructure as well as in the automotive industry. Kenaf fiber is usually reinforced with synthetic based polymer resin such as polypropylene. However, recent studies tend to concern towards the environmental issues which kenaf fiber act as an alternative natural fiber competitor. Moreover, the combination of the natural fiber and the biodegradable polymer able to reduce the negative impact on human health. Hence, researcher-initiated the interest focusing on the biodegradable materials obtained from the renewable sources. A huge attention gave to the kenaf fiber reinforced bio-polymer materials such as polylactic acid. The processing technique and the fiber orientation within the composite materials are discussed extensively in order to obtain the maximum composite performance. Results indicated that the mechanical properties; tensile strength and tensile modulus, are improved as the kenaf fiber was aligned in uni-direction. Therefore, this paper overview on the kenaf retting types in the common form of kenaf fibers and discussing the thermoplastic polymer matrices types used in the fabrication processes. In addition, the challenging of using kenaf fibers composites and its application in the automotive industry also highlighted.
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Abir, Md Masudur R., S. M. Kashif et Md Abdur Razzak. « Tensile and Statistical Analysis of Sisal Fibers for Natural Fiber Composite Manufacture ». Advanced Materials Research 1115 (juillet 2015) : 349–52. http://dx.doi.org/10.4028/www.scientific.net/amr.1115.349.
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To achieve sustainability in the composite industry, natural fibers must be able to replace synthetic fibers .In this work the tensile properties of sisal fibers were determined. The relationships between tensile strength, young modulus, failure to strain and gage length was studied. Also variation in tensile strength was quantified using statistical analysis. The relationship between Weibull statistics and gage length were also investigated. The strength of the sisal fiber obtained in this work was between 255-377 MPA and decreased with an increase in gage length. The Weibull modulus obtained was similar for all gage lengths and was around 2.5.
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Oliari Garcez, Estela, Muhammad Ikramul Kabir, Alastair MacLeod, Mahbube Subhani et Kazem Ghabraie. « Self-Compacting Concrete Reinforced with Twisted-Bundle Macro-Synthetic Fiber ». Applied Sciences 9, no 12 (21 juin 2019) : 2543. http://dx.doi.org/10.3390/app9122543.
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The use of self-compacting concrete (SCC) reinforced with fibers has great potential in the precast concrete industry as the concrete can be delivered straight into the moulds, without any vibration or compacting effort. Similarly, it has the potential to replace traditional steel reinforcement depending on the design requirements. Novel synthetic fibers have recently become available in the market, but still, limited information is available on the performance of SCC reinforced with such fibers. This paper investigates the use of twisted-bundle macro-synthetic fiber in self-compacting concrete. Three different concrete mixtures with fiber dosage of 4, 6, and 8 kg/m3 were produced in large scale batches, and their performance was compared in terms of slump-flow, compressive strength, split tensile strength, modulus of elasticity, and flexural strength. Moreover, a comprehensive evaluation of the post-cracking residual strength is presented. It was found that the mixture with 4 kg/m3 fiber content has the most satisfactory flowability, whereas 8 kg/m3 mixture achieved the highest residual flexural strength. Based on the observed post-cracking behavior, a simplified stress-crack opening constitutive law is proposed. Since the fiber dosage affects the residual flexural strength, a factor related to fiber content is recommended while determining the ultimate residual flexural strength.
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Souza, Eduardo Garcia, et Elvis Silveira-Martins. « Weaving the gold thread : strategic resources in a fashion industry ». REBRAE 10, no 3 (23 août 2017) : 416. http://dx.doi.org/10.7213/rebrae.10.003.ao05.
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In the field of business strategy, the resource-based view demonstrates through the firm’s resources its ability to gain competitive advantage. This research had as objective identifying the resources that can be considered strategic in an industry of artisan fashion and thus to generate competitive advantage in this sector. The research method consists in a case study through a qualitative approach, where interviews were made with members of the organization and an external consultant. The data were analyzed through content analysis. The analyzed industry manufactures artisan fashion pieces with natural wool and demonstrates internal attributes that appear as differentials. Natural wool was once one of the great products of Rio Grande do Sul and had its decay with the emergence of synthetic fibers in the post-war period. Now another perspective emerges for the so-called 'White Gold' and its use as a competitive differential allied to the quality and sustainability of organic fibers and regional identity valued in this market.
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Stefan, Daniela Simina, Magdalena Bosomoiu et Mircea Stefan. « Methods for Natural and Synthetic Polymers Recovery from Textile Waste ». Polymers 14, no 19 (21 septembre 2022) : 3939. http://dx.doi.org/10.3390/polym14193939.
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Trends in the textile industry show a continuous increase in the production and sale of textile materials, which in turn generates a huge amount of discarded clothing every year. This has a negative impact on the environment, on one side, by consuming resources—some of them non-renewables (to produce synthetic polymers)—and on the other side, by polluting the environment through the emission of GHGs (greenhouse gases), the generation of microplastics, and the release of toxic chemicals in the environment (dyes, chemical reagents, etc.). When natural polymers (e.g., cellulose, protein fibers) are used for the manufacturing of clothes, the negative impact is transferred to soil pollution (e.g., by using pesticides, fertilizers). In addition, for the manufacture of clothes from natural fibers, large amounts of water are consumed for irrigation. According to the European Environment Agency (EEA), the consumption of clothing is expected to increase by 63%, from 62 million tonnes in 2019 to 102 million tonnes in 2030. The current article aims to review the latest technologies that are suitable for better disposal of large quantities of textile waste.
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Eshbaeva, U. Ja, et A. A. Djalilov. « Composite technology for the production of paper and cardboard including synthetic fibers ». Proceedings of the National Academy of Sciences of Belarus, Chemical Series 58, no 4 (29 novembre 2022) : 418–22. http://dx.doi.org/10.29235/1561-8331-2022-58-4-418-422.
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In the modern world, the importance and volumes of packaging produced are constantly increasing. It is a powerful means of promoting goods on the market, but at the same time, the role of its quality increases. Currently, paper and paperboard packaging is not only a significant part of paper and paperboard market in general, but also a large part of the world’s packaging consumption. Currently, the world pays special attention to the use of secondary paper waste for the production of paper and cardboard and increase the volume of their processing. The article is devoted to the production of new types of multilayer paper and cardboard with the addition of chemical fiber and secondary waste, as well as high-quality paper and cardboard that can be used in the printing industry, in order to save valuable cotton cellulose in the country. However, the article shows in what proportions it is advisable to use secondary fibers in combination with cellulose in the production of multilayer composite paper and cardboard for the printing and paper industries.
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Markowska, Agnieszka, Adam Roman Markowski et Iwona Jarocka-Karpowicz. « The Importance of 6-Aminohexanoic Acid as a Hydrophobic, Flexible Structural Element ». International Journal of Molecular Sciences 22, no 22 (9 novembre 2021) : 12122. http://dx.doi.org/10.3390/ijms222212122.
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6-aminohexanoic acid is an ω-amino acid with a hydrophobic, flexible structure. Although the ω-amino acid in question is mainly used clinically as an antifibrinolytic drug, other applications are also interesting and important. This synthetic lysine derivative, without an α-amino group, plays a significant role in chemical synthesis of modified peptides and in the polyamide synthetic fibers (nylon) industry. It is also often used as a linker in various biologically active structures. This review concentrates on the role of 6-aminohexanoic acid in the structure of various molecules.
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Koronis, Georgios, Arlindo Silva et Michael Ong. « Comparison of Structural Performance and Environmental Impact of Epoxy Composites Modified by Glass and Flax Fabrics ». Journal of Composites Science 6, no 10 (27 septembre 2022) : 284. http://dx.doi.org/10.3390/jcs6100284.
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Comparing the structural performance and environmental impact of parts made of natural and synthetic fibers has become increasingly important for industry and education, as the benefits of one type of fiber over another are not always clear. The current work discusses the advantages and disadvantages of using natural and synthetic fibers and compares the flexural performance of parts made of each of these fibers and their environmental impact. This paper investigates the flexural behavior of epoxy composites modified by glass and flax fabrics through experimental, numerical, and analytical studies. Specimens with various fabrics (dried and non-dried) were fabricated to test their performance. The failure of unidirectional glass and flax fiber reinforced polymer composite laminate was examined by destructive testing. A finite-element model was developed, and the mechanical behaviors of fiber-reinforced composites were predicted in a three-point bending test. Experimental results were compared to numerical analysis to validate the model’s accuracy. A life cycle assessment (LCA) was employed to determine the climate impact of composite production. The analysis revealed a decreased environmental effect of plant-based panels suggesting that they are less energy and CO2 intensive than synthetic solutions. The LCA model can be applied in further studies of products that consist of or use flax-based composites.
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Madival, Abhishek Sadananda, Deepak Doreswamy, Srinivasulu Maddasani, Manjunath Shettar et Raviraj Shetty. « Processing, Characterization of Furcraea foetida (FF) Fiber and Investigation of Physical/Mechanical Properties of FF/Epoxy Composite ». Polymers 14, no 7 (6 avril 2022) : 1476. http://dx.doi.org/10.3390/polym14071476.
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In recent days the rising concern over environmental pollution with excessive use of synthetic materials has led to various eco-friendly innovations. Due to the organic nature, abundance and higher strength, natural fibers are gaining a lot of interest among researchers and are also extensively used by various industries to produce ecological products. Natural fibers are widely used in the composite industry as an alternative to synthetic fibers for numerous applications and new sources of fiber are continuously being explored. In this study, a fiber extracted from the Furcraea foetida (FF) plant is characterized for its feasibility as a reinforcement to fabricate polymer composite. The results show that the fiber has a density of 0.903 ± 0.07 g/cm3, tensile strength (σt) of 170.47 ± 24.71 MPa and the fiber is thermally stable up to 250 °C. The chemical functional groups and elements present in the FF fiber are evaluated by conducting Fourier transform infrared spectroscopy (FT-IR) and energy dispersive spectroscopy (EDS). The addition of FF fibers in epoxy reduced the density (13.44%) and hardness (10.9%) of the FF/Epoxy (FF/E) composite. However, the void content (Vc < 8%) and water absorption (WA: < 6%) rate increased in the composite. The FF/E composite with 30% volume of FF fibers showed maximum σt (32.14 ± 5.54 MPa) and flexural strength (σf: 80.23 ± 11.3 MPa).
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Tammaro, A., C. Abruzzese, A. Narcisi, G. Cortesi, F. R. Grippaudo, F. Persechino, F. R. Parisella et S. Persechino. « Disperse Yellow Dye : An Emerging Professional Sensitizer in Contact Allergy Dermatitis ». European Journal of Inflammation 10, no 3 (septembre 2012) : 525–26. http://dx.doi.org/10.1177/1721727x1201000328.
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Disperse dyes are well known as common sensitizers in contact allergy dermatitis. Disperse yellow 3 is usually adopted in the textile industry for dying synthetic fibers, but is also used in hair dyes and for colouring plastic materials. We describe three cases of two males and one female patient, respectively a painter, an actor and a nursery-school teacher, who presented contact allergy dermatitis to disperse yellow 3 dye.
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Serra, Albert, Ferran Serra-Parareda, Fabiola Vilaseca, Marc Delgado-Aguilar, Francesc X. Espinach et Quim Tarrés. « Exploring the Potential of Cotton Industry Byproducts in the Plastic Composite Sector : Macro and Micromechanics Study of the Flexural Modulus ». Materials 14, no 17 (24 août 2021) : 4787. http://dx.doi.org/10.3390/ma14174787.
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The textile sector produces yearly great quantities of cotton byproducts, and the major part is either incinerated or landfilled, resulting in serious environmental risks. The use of such byproducts in the composite sector presents an attractive opportunity to valorize the residue, reduce its environmental impact, and decrease the pressure on natural and synthetic resources. In this work, composite materials based on polypropylene and dyed cotton byproducts from the textile industry were manufactured. The competitiveness of the resulting composites was evaluated from the analyses, at macro and micro scales, of the flexural modulus. It was observed that the presence of dyes in cotton fibers, also a byproduct from the production of denim items, notably favored the dispersion of the phases in comparison with other cellulose-rich fibers. Further, the presence of a coupling agent, in this case, maleic anhydride grafted polypropylene, enhanced the interfacial adhesion of the composite. As a result, the flexural modulus of the composite at 50 wt.% of cotton fibers enhanced by 272% the modulus of the matrix. From the micromechanics analysis, using the Hirsch model, the intrinsic flexural modulus of cotton fibers was set at 20.9 GPa. Other relevant micromechanics factors were studied to evaluate the contribution and efficiency of the fibers to the flexural modulus of the composite. Overall, the work sheds light on the potential of cotton industry byproducts to contribute to a circular economy.
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Du, Jiang, Chuanzhi Pu, Xianyu Sun, Qi Wang, Hongqing Niu et Dezhen Wu. « Preparation and Interfacial Properties of Hydroxyl-Containing Polyimide Fibers ». Polymers 15, no 4 (19 février 2023) : 1032. http://dx.doi.org/10.3390/polym15041032.
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Developing polyimide (PI) fibers with excellent interfacial adhesion and high mechanical properties for the PI fiber-reinforced polymer matrix composites (PFRPs) industry has been challenging. In this work, 4,4′-diamino-(1,1′-biphenyl)-3,3′-diol (HAB) diamine was introduced into the rigid molecular chains, and the high-performance PI fibers, presenting an interfacial shear strength (IFSS) value of 46.33 MPa, tensile strength of 2.62 GPa, and modulus of 100.15 GPa, were successfully manufactured when the content of HAB in mixed diamines was 30 mol %. Fourier transform infrared (FTIR) spectroscopy identified the presence of intermolecular H-bonding interactions, and 2D small-angle X-ray scattering indicated that the introduction of HAB moiety contributed to reducing the radii of microvoids in the fibers, which were considered to be the key factors leading to a significant enhancement in the mechanical properties of the fibers. X-ray photoelectron spectroscopy (XPS) and the static contact angle intuitively illustrated that the synthetic fiber surface contained active hydroxyl groups. The IFSS value of PI fiber/epoxy resin composites (PI/EPs) was 56.47 MPa when the content of HAB reached 70 mol %. Failure morphologies confirmed that the interfacial adhesion of PI/EPs was enhanced owing to the surface activity of PI fibers. Consequently, this study provides an effective strategy to the long-standing problems of high mechanical performances and poor surface activity for traditional PI fibers used in the PFRPs industry.
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Bahrami, Mohsen, Juana Abenojar et Miguel Ángel Martínez. « Recent Progress in Hybrid Biocomposites : Mechanical Properties, Water Absorption, and Flame Retardancy ». Materials 13, no 22 (15 novembre 2020) : 5145. http://dx.doi.org/10.3390/ma13225145.
Texte intégralRésumé :
Bio-based composites are reinforced polymeric materials in which one of the matrix and reinforcement components or both are from bio-based origins. The biocomposite industry has recently drawn great attention for diverse applications, from household articles to automobiles. This is owing to their low cost, biodegradability, being lightweight, availability, and environmental concerns over synthetic and nonrenewable materials derived from limited resources like fossil fuel. The focus has slowly shifted from traditional biocomposite systems, including thermoplastic polymers reinforced with natural fibers, to more advanced systems called hybrid biocomposites. Hybridization of bio-based fibers/matrices and synthetic ones offers a new strategy to overcome the shortcomings of purely natural fibers or matrices. By incorporating two or more reinforcement types into a single composite, it is possible to not only maintain the advantages of both types but also alleviate some disadvantages of one type of reinforcement by another one. This approach leads to improvement of the mechanical and physical properties of biocomposites for extensive applications. The present review article intends to provide a general overview of selecting the materials to manufacture hybrid biocomposite systems with improved strength properties, water, and burning resistance in recent years.
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Ruuth, Edvin, Miguel Sanchis-Sebastiá, Per Tomas Larsson, Anita Teleman, Amparo Jiménez-Quero, Sara Delestig, Viktor Sahlberg et al. « Reclaiming the Value of Cotton Waste Textiles : A New Improved Method to Recycle Cotton Waste Textiles via Acid Hydrolysis ». Recycling 7, no 4 (12 août 2022) : 57. http://dx.doi.org/10.3390/recycling7040057.
Texte intégralRésumé :
The fashion industry is becoming one of the largest emitters worldwide due to its high consumption of raw materials, its effluents, and the fact that every garment will eventually contribute to the vast amount of waste being incinerated or accumulating in landfills. Although fiber-to-fiber recycling processes are being developed, the mechanical properties of the textile fibers are typically degraded with each such recycle. Thus, tertiary recycling alternatives where textiles are depolymerized to convert them into valuable products are needed to provide end-of-life alternatives and to achieve circularity in the fashion industry. We have developed a method whereby cotton waste textiles are depolymerized to form a glucose solution, using sulfuric acid as the sole catalyst, with a high yield (>70%). The glucose solution produced in this process has a high concentration (>100 g/L), which reduces the purification cost and makes the process industrially relevant. This method can be applied regardless of the quality of the fibers and could therefore process other cellulosic fibers such as viscose. The glucose produced could subsequently be fermented into butanediol or caprolactam, precursors for the production of synthetic textile fibers, thus retaining the value of the waste textiles within the textile value chain.
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da Silva, Thuane Teixeira, Pedro Henrique Poubel Mendonça da Silveira, André Ben-Hur da Silva Figueiredo, Sérgio Neves Monteiro, Matheus Pereira Ribeiro, Lucas de Mendonça Neuba, Noan Tonini Simonassi, Fabio da Costa Garcia Filho et Lucio Fabio Cassiano Nascimento. « Dynamic Mechanical Analysis and Ballistic Performance of Kenaf Fiber-Reinforced Epoxy Composites ». Polymers 14, no 17 (2 septembre 2022) : 3629. http://dx.doi.org/10.3390/polym14173629.
Texte intégralRésumé :
Several industry sectors have sought to develop materials that combine lightness, strength and cost-effectiveness. Natural lignocellulosic natural fibers have demonstrated to be efficient in replacing synthetic fibers, owing to several advantages such as costs 50% lower than that of synthetic fibers and promising mechanical specific properties. Polymeric matrix composites that use kenaf fibers as reinforcement have shown strength increases of over 600%. This work aims to evaluate the performance of epoxy matrix composites reinforced with kenaf fibers, by means of dynamic-mechanical analysis (DMA) and ballistic test. Through DMA, it was possible to obtain the curves of storage modulus (E′), loss modulus (E″) and damping factor, Tan δ, of the composites. The variation of E′ displayed an increase from 1540 MPa for the plain epoxy to 6550 MPa for the 30 vol.% kenaf fiber composites, which evidences the increase in viscoelastic stiffness of the composite. The increase in kenaf fiber content induced greater internal friction, resulting in superior E″. The Tan δ was considerably reduced with increasing reinforcement fraction, indicating better interfacial adhesion between the fiber and the matrix. Ballistic tests against 0.22 caliber ammunition revealed similar performance in terms of both residual and limit velocities for plain epoxy and 30 vol.% kenaf fiber composites. These results confirm the use of kenaf fiber as a promising reinforcement of polymer composites for automotive parts and encourage its possible application as a ballistic armor component.
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Irwan Suriaman, Mardiyati, Jooned Hendrarsakti et Ari Darmawan Pasek. « Potensi Pemanfaatan Serat Selulosa sebagai Material Bahan Baku dalam Sintesis Filter Udara Non-Woven sesuai Standar TAPPI T 205 ». Jurnal Teknologika 10, no 2 (26 novembre 2020) : 37–42. http://dx.doi.org/10.51132/teknologika.v10i2.80.
Texte intégralRésumé :
Industry 4.0 era materials used by entrepreneurs should be recycled, environmentally friendly, renewable with less chemical content. Indonesia as a tropical country has a large land area with the potential to produce the largest natural fiber in the world. One opportunity that can be applied to the utilization of natural fibers in air filters that currently use dominant materials is synthetic fibers. natural fiber has the advantage because it does not contain toxic chemicals, local raw materials, and is easily produced. This research will analyze the mechanical and morphological characteristics of biological fibers that have great potential as pre-filter raw material. Analysis of mechanical properties through tensile strength testing for single fibers and morphological analysis through scanning electron microscopy (SEM). Tensile testing was the results are; palm oil has a tensile strength of 620 MPa; 998 MPa and 213 MPa flax coconut fiber. For the morphological test results from SEM analysis for ramie fiber, it looks solid without fiber holes; The fibers appear to be many small fibers bound to one another while coir fibers have many pore holes in one observed fiber.
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Khalid, Muhammad Yasir, Ramsha Imran, Zia Ullah Arif, Naveed Akram, Hassan Arshad, Ans Al Rashid et Fausto Pedro García Márquez. « Developments in Chemical Treatments, Manufacturing Techniques and Potential Applications of Natural-Fibers-Based Biodegradable Composites ». Coatings 11, no 3 (4 mars 2021) : 293. http://dx.doi.org/10.3390/coatings11030293.
Texte intégralRésumé :
The utilization of synthetic materials stimulates environmental concerns, and researchers worldwide are effectively reacting to environmental concerns by transitioning towards biodegradable and sustainable materials. Natural fibers like jute and sisal have been being utilized for ages in several applications, such as ropes, building materials, particle boards, etc. The absence of essential information in preparing the natural-fiber-reinforced materials is still a challenge for future applications. Chemical treatments and surface modifications can improve the quality of the natural fibers. Natural-fiber-based composites are a potential candidate for many lightweight engineering applications with significant mechanical properties. In the view of the progressive literature reported in the field, this work aims to present the significance of natural fibers, their composites, and the main factors influencing these materials for various applications (automotive industry, for instance). Secondly, we aim to address different surface modifications and chemical treatments on natural fibers and finally provide an overview of natural fiber reinforced polymer composites’ potential applications.
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Loh, Leong Tatt, Ming Kun Yew, Ming Chian Yew, Jing Han Beh, Foo Wei Lee, Siong Kang Lim et Kok Zee Kwong. « Mechanical and Thermal Properties of Synthetic Polypropylene Fiber–Reinforced Renewable Oil Palm Shell Lightweight Concrete ». Materials 14, no 9 (30 avril 2021) : 2337. http://dx.doi.org/10.3390/ma14092337.
Texte intégralRésumé :
Oil palm shell (OPS) is an agricultural solid waste from the extraction process of palm oil. All these wastes from industry pose serious disposal issues for the environment. This research aims to promote the replacement of conventional coarse aggregates with eco-friendly OPS aggregate which offers several advantages, such as being lightweight, renewable, and domestically available. This paper evaluates the mechanical and thermal performances of renewable OPS lightweight concrete (LWC) reinforced with various type of synthetic polypropylene (SPP) fibers. Monofilament polypropylene (MPS) and barchip polypropylene straight (BPS) were added to concrete at different volume fractions (singly and hybrid) of 0%, 0.1%, 0.3% and 0.4%. All specimens were mixed by using a new mixing method with a time saving of up to 14.3% compared to conventional mixing methods. The effects of SPP fibers on the mechanical properties were investigated by compressive strength, splitting tensile strength and residual strength. The strength of the oil palm shell lightweight concrete hybrid 0.4% (OPSLWC–HYB–0.4%) mixture achieved the highest compressive strength of 29 MPa at 28 days. The inclusion of 0.3% of BPS showed a positive outcome with the lowest thermal conductivity value at 0.55 W/m °C. Therefore, the results revealed that incorporation of BPS fiber enhanced the performance of thermal conductivity tests as compared to inclusion of MPS fiber. Hence, renewable OPS LWC was proven to be a highly recommended environmentally friendly aggregate as an alternative solution to replace natural aggregates used in the concrete industry.
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Omar, Nurihan, S. Najwa S. Mohd, Y. Aminanda, J. S. Mohammed Ali et S. M. Kashif. « Experimental Study on Jute-Fiber-Epoxy Composite Plate Subjected to Impact Loading ». Advanced Materials Research 576 (octobre 2012) : 232–35. http://dx.doi.org/10.4028/www.scientific.net/amr.576.232.
Texte intégralRésumé :
World is currently focusing on alternate material sources that are environment friendly and biodegradable in nature. Due to the increasing environmental concerns, bio-composite made from natural fibers and polymeric resin, is one of the recent developments in the industry and constitute the present scope of experimental work. This work presents on advantages, mechanical and physical behavior of jute fiber – epoxy composites, one of the renewable alternatives. The bio-composite is experimentally investigated in term of low velocity impact loading. The experimental observations in term of damage mechanism, maximum force and maximum energy absorption were studied to understand the effect of fiber orientation. A comparative study with typical synthetic fibers like carbon and glass were also conducted.
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Wright, Annette C. « Strategy and Structure in the Textile Industry : Spencer Love and Burlington Mills, 1923-1962 ». Business History Review 69, no 1 (1995) : 42–79. http://dx.doi.org/10.2307/3117120.
Texte intégralRésumé :
Shrewd product selection allowed Spencer Love to build Burlington Mills into a large profitable firm in what most observers regarded as a declining industry, textiles. Using integration, diversification, and a multidivisional structure, he then attempted to have Burlington dominate its industry just as a few other large corporations controlled steel, automobiles, and chemicals. In textiles, however, powerful forces constrained and sometimes defeated these strategies. After the emergence of artificial and synthetic fibers, textile mills became dependent on large yarn manufacturers in the chemical industry such as Du Pont and Celanese. In addition, large size and diversification did not always protect a company's profits, and forward integration into the volatile women's garment industry proved to be especially dangerous. In the end, Love concluded that Burlington should remain a weaving and knitting company; when he died in 1962, textiles remained an industry in which small, specialized firms survived alongside the corporate giants.
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Makhlouf, Said, Souad Khedache, Dihia Djefel et Gilles Lefebvre. « Thermomechanical Characterization of a Mortar Reinforced by Animal Fibers ». Key Engineering Materials 550 (avril 2013) : 91–98. http://dx.doi.org/10.4028/www.scientific.net/kem.550.91.
Texte intégralRésumé :
To meet the needs always more accurate and demanding in the construction industry, mechanical and thermal or acoustic features of building materials have known significant improvements over the last two decades. Researchers in materials science and civil engineering are constantly listening to the industry and continue to innovate in this field. The current trend is the search for new materials, called intelligent, where several properties as mechanical and physico-chemical are combined. In our case, the aim was to develop a new construction material reaching the construction standards, --- i.e. with acceptable mechanical properties --- but which is also able to perform other functions such as thermal insulation or sound insulation. To do this, we chose to strengthen a cement mortar with natural fibers obtained from poultry feather. A physical and chemical stability behavior is obtained thanks to a treatment performed before their incorporation into the composite matrix. The fibers are introduced in a mortar matrix as a substitute for mineral or synthetic fibers which are traditionally used for this purpose. The cylindrical and prismatic specimens were then prepared with the composite in order to determine the mechanical characteristics of this composite. Compression tests and three-point bending were carried out for this purpose. To determine the thermal conductivity of composites, several plates with different percentages of fiber, whose size is 300x300x10 mm3, was chosen in order to be adaptable to the experimental device, were fabricated.
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Al Rashid, Ans, Muhammad Yasir Khalid, Ramsha Imran, Umair Ali et Muammer Koc. « Utilization of Banana Fiber-Reinforced Hybrid Composites in the Sports Industry ». Materials 13, no 14 (16 juillet 2020) : 3167. http://dx.doi.org/10.3390/ma13143167.
Texte intégralRésumé :
The sports industry is an ever-growing sector worldwide. With technological advancements in information technologies, the sports industry has merged with the entertainment industry, reaching and influencing billions of people globally. However, to ensure and advance the safety, security, and sustainability of the sports industry, technological innovations are always needed in several manufacturing and materials processes to achieve cost-effectiveness, efficiency, durability, reusability, and recyclability of products used in this industry. For example, 90% of the field hockey equipment produced in the world comes from Sialkot, Pakistan. Most export quality field hockey equipment is currently produced via reinforcement of glass/carbon fibers in epoxy resin. The current study aimed to introduce new materials for field hockey equipment to reduce manufacturing costs and the environmental impact of synthetic materials, without comprising the quality of the final product. Our literature review on natural fibers revealed that they offer excellent and compatible mechanical properties. Based on extensive experimental studies, we concluded that banana fiber reinforced hybrid composites could be an alternative to pure glass fiber reinforced composites, with comparable and even higher load withstanding capabilities. Using banana fiber reinforced hybrid composites for the fabrication of hockey products would cut costs and lower the environmental impact stemming from the uses of biodegradable organic materials. It will also lead to the development of a domestic economy based on domestic resources.
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Wan Ahmad, Wan Yunus, M. A. Mohd Nor, N. Saim, M. I. Ab Kadir et M. R. Ahmad. « Nano Natural Dyes from Melastoma Malabathricum L. » Advanced Materials Research 545 (juillet 2012) : 59–63. http://dx.doi.org/10.4028/www.scientific.net/amr.545.59.
Texte intégralRésumé :
In this study, natural colours were produced from Melastoma Malabathricum L.’s (Senduduk) plant. The dyes were extracted from the petal part of the plant using solvent extraction method of acidified methanol and methanol. The natural colours were then converted into powder form of nano size scale using a ball mill grinder. Silk fabrics were used as the substrate and dyed using several natural and synthetic mordant. The use of different solvents for extraction and mordant for dyeing resulted in different colour shades on the silk fabrics. The color fastness to washing tests revealed colour fastness to washing ranging from 3 – 4/5 and the change in color ranging from 3/4 – 4/5. The findings will benefit and promote the dyeing and printing industry such as batik manufacturers and local fashion industry in using natural dyes. On the other hand, dyes from plants can also be used as an alternative to synthetic dyes for dyeing natural silk fibers.
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Milosevic, Marko, Petr Valášek et Alessandro Ruggiero. « Tribology of Natural Fibers Composite Materials : An Overview ». Lubricants 8, no 4 (4 avril 2020) : 42. http://dx.doi.org/10.3390/lubricants8040042.
Texte intégralRésumé :
In the framework of green materials, in recent years, natural fiber composites attracted great attention of academia and industry. Their mechanical and tribological characteristics, such as high strength, elasticity, friction, and wear resistance, make them suitable for a wide range of industrial applications in which issues regarding a large amount of disposal are to be considered since their environmental friendliness gives them an advantage over conventional synthetic materials. Based on the recent and relevant investigations found in the scientific literature, an overview focused on the tribological characteristics of composite materials reinforced with different types of natural fibers is presented. The aim is to introduce the reader to the issues, exploring the actual knowledge of the friction and wear characteristics of the composites under the influence of different operating parameters, as well as the chemical treatment of fibers. The main experimental tribological techniques and the main used apparatus are also discussed, with the aim of highlighting the most appropriate future research directions to achieve a complete framework on the tribological behavior of many possible natural fiber composite materials.
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Dweik, Hassan. « The Plastic Industry worldwide and in Palestine ». Al-Quds Journal for Academic Research 01, no 1 (1 avril 2021) : 5. http://dx.doi.org/10.47874/2021p9.
Texte intégralRésumé :
A world without plastics or synthetic polymers can't be imagined today. The first synthetic plastics was produced in the beginning of the twentieth century, however industrial plastics production started in 1950. Production of plastic materials to day surpasses any other synthetic material with the exception of steel and cement. The share of plastics in municipal solid waste increased from 1% in the 1960 to more than 10% in 2005. Most monomers used today to make plastics such polyethylene (PE) or Polypropylene (PP), or polystyrene (PS) are produced from the petroleum industry and none is biodegradable, they accumulate in the environment and pose great threat and serious concern to humanity and to marine life. In 2010 approximately 8 Million Metric Ton (MT) of plastic waste entered the marine environment. Global production of polymers and fiber increased from 2 (MT) in 1960 to 380(MT) in 2015 a compound annual growth rate (CAGR) of 8.4% while the total production of polymers and fibers from 1960 – 2015 was estimated to be around 7800 (MT). China alone produces 28%, and 68% of world production of PP. Biodegradable plastics amount to only 4 (MT). Non fiber plastics production is (PE 36%, PP 21%), Polyvinylchloride PVC (12%) followed by polyethylene terphthalate PET, polyurethane, and polystyrene less than 10% each ,42% of plastics are used in packaging. Palestine show a fast-growing plastic industry though we import plastics worth 255 million US $ as reported in the United Nations International Trade Statistics (COMTRADE) in 2018, compared to US $200 Million imported in 2014. However, we were able to export to the world 66.3 million US $ worth of plastic materials added to that our export to Israel of plastic product worth 86 million US $, mostly packaging materials. Three important countries that export plastic materials to Palestine are Turkey. China and south Korea. Turkey alone in 2018 exported plastics worth 25 million $. The plastic industry in Palestine is among the largest industry. However, we still manufacture the traditional plastics for packaging. Our country needs to develop this industry and diversify the plastic products to meet the needs of the market such as automobile, electrical appliances, refrigerators, and many other industries.
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Araya-Letelier, Gerardo, Federico C. Antico, Pablo Fernado Parra et Miguel Carrasco. « Fiber-Reinforced Mortar Incorporating Pig Hair ». Advanced Engineering Forum 21 (mars 2017) : 219–25. http://dx.doi.org/10.4028/www.scientific.net/aef.21.219.
Texte intégralRésumé :
Recycled fibers from food-industry could be added as reinforcement to cement-based materials. Cement-based materials perform well under compression, but tensile strength and post-cracking ductility in tension are poor. Fibers produced from steel, glass and synthetic materials, have been successfully used to overcome some of these shortcomings. Fiber-reinforced mortar has shown an increased post-cracking ductility and improved long-term serviceability due to the crack control provided by fibers. Food-industry waste disposal is globally a major concern because of its environmental impacts. For these reasons, the use of recycled materials in construction applications has been investigated over the last decades. This investigation deals with the incorporation of pig hair, which is a waste produced by the food-industry worldwide, in fiber-reinforced mortars. This composite material is intended to reduce the environmental impacts by valuing waste materials in construction applications while improving mechanical properties. To determine compressive, flexural and impact strength, bulk density, porosity and dynamic modulus of elasticity laboratory tests were conducted in mortar specimens with 0%, and 2% of pig-hair content in weight of cement. The results of this research show that the impact strength can increase up to five times when compared to plain mortar. Moreover, the compressive and flexural strengths, bulk density, porosity and the dynamic modulus of elasticity of fiber-reinforced mortar, with the aforementioned pig-hair content, are not significantly affected.
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Rimondi, Valentina, Alessio Monnanni, Eleonora De Beni, Gabriele Bicocchi, David Chelazzi, Alessandra Cincinelli, Sara Fratini et al. « Occurrence and Quantification of Natural and Microplastic Items in Urban Streams : The Case of Mugnone Creek (Florence, Italy) ». Toxics 10, no 4 (26 mars 2022) : 159. http://dx.doi.org/10.3390/toxics10040159.
Texte intégralRésumé :
The terrestrial environment is an important contributor of microplastics (MPs) to the oceans. Urban streams, strictly interwoven in the city network and to the MPs’ terrestrial source, have a relevant impact on the MP budget of large rivers and, in turn, marine areas. We investigated the fluxes (items/day) of MPs and natural fibers of Mugnone Creek, a small stream crossing the highly urbanized landscape of Florence (Italy) and ending in the Arno River (and eventually to the Tyrrhenian Sea). Measurements were done in dry and wet seasons for two years (2019–2020); stream sediments were also collected in 2019. The highest loads of anthropogenic particles were observed in the 2019 wet season (109 items/day) at the creek outlet. The number of items in sediments increased from upstream (500 items/kg) to urban sites (1540 items/kg). Fibers were the dominant shape class; they were mostly cellulosic in composition. Among synthetic items, fragments of butadiene-styrene (SBR), indicative of tire wear, were observed. Domestic wastewater discharge and vehicular traffic are important sources of pollution for Mugnone Creek, especially during rain events. The study of small creeks is of pivotal importance to limit the availability of MPs in the environment.
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Grafe, Timothy, et Kristine Graham. « Polymeric Nanofibers and Nanofiber Webs : A New Class of Nonwovens ». International Nonwovens Journal os-12, no 1 (mars 2003) : 1558925003os—12. http://dx.doi.org/10.1177/1558925003os-1200113.
Texte intégralRésumé :
Nanofiber is a broad phrase generally referring to a fiber with a diameter less than 1 micron. While glass fibers have existed in the sub-micron range for some time and polymeric meltblown fibers are just beginning to break the micron barrier, 0.25 micron diameter electrospun nanofibers have been manufactured and used commercially for air filtration applications for more than twenty years. Several value-added nonwoven applications, including filtration, barrier fabrics, wipes, personal care, medical and pharmaceutical applications may benefit from the interesting technical properties of commercially available nanofibers and nanofiber webs. This paper will discuss the electrospinning process for making nanofibers and nonwoven nanofiber webs from synthetic fiber-forming polymers. The resulting physical characteristics of the nanofiber webs will be discussed. In order to provide a useful context for the nonwovens industry, nanofiber webs will be compared to both melt-blown and spunbond nonwovens. The description and comparison of the properties should provide product designers in the nonwovens industry with the tools to generate product and applications ideas about new uses for nanofibers.
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D’Eusanio, Veronica, Laura Maletti, Andrea Marchetti, Fabrizio Roncaglia et Lorenzo Tassi. « Volatile Aroma Compounds of Gavina® Watermelon (Citrullus Lanatus L.) Dietary Fibers to Increase Food Sustainability ». AppliedChem 3, no 1 (31 janvier 2023) : 66–88. http://dx.doi.org/10.3390/appliedchem3010006.
Texte intégralRésumé :
To deal with climate emergency and reduce environmental impact, agro-industrial wastes are gradually gaining interest and are being used for new products and applications. The large production of watermelons represents an opportunity because of the many byproducts that can be transformed into innovative and valuable foodstuffs. In this study, we examined the lycopene-rich whole dietary fiber (WDF) obtained from the watermelon pomace of a peculiar cultivar, Gavina® (Oristano, Italy) a seedless fruit from Sardinia (Italy). The volatile chemical composition of the WDF was investigated using Solid-Phase Microextraction-Gas Chromatography/Mass Spectrometry (SPME-GC/MS). The aim was to follow the evolution of the Volatile Organic Compounds (VOCs) fraction during storage and verify its stability over time. Since watermelon is an excellent source of carotenoids, their byproducts were the most abundant VOCs of the freshly prepared samples, but their overall abundance decreased significantly during storage. The opposite trend was observed for acids and aldehydes, whose increase over time is related to amino acid degradation. Freshly prepared WDF can be used in the food industry as an antioxidant-rich dietary fiber that imparts a characteristic and pleasant aroma. Over time, its aroma profile and carotenoid content change considerably, reducing its health properties and limiting its potential application as a natural flavor.
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Teirumnieka, Ērika, Dagnija Blumberga et Edmunds Teirumnieks. « THE APPLICATION OF HEMP IN BIOECONOMY ». ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (16 juin 2021) : 281–87. http://dx.doi.org/10.17770/etr2021vol1.6966.
Texte intégralRésumé :
Global trends in the world are currently representing a serious incentive to bring ‘green thinking’ to life. This is the case of replacing synthetic materials derived from fossil resources with natural-origin, renewable resources. In the automotive industry and other segments of the manufacturing industry, increasing attention is being paid to the use of natural fibers in the manufacturing of composite materials. For example, flax and hemp fiber, as reinforcing material, is starting to widely replace carbon fiber. It is not just an ecological benefit, but also an important product protecting human health, since the amount of emissions that pollute the environment is minimized. Consequently, that lead to reduced intake by human being of harmful substances that would affect its health status. Existing composite materials used in motor vehicles, produced from carbon fibers, are creating very sharp fracture areas in the event of accidents causing human injury, while materials from natural fiber plants in this case are free from sharp edges at the place of fracture. Raw materials derived from hemp processing are used in the automotive, textile industry, construction (hemp concrete, heat insulation material), energy, biofuel production, arts and design, paper production, food, medicine, etc. This paper covers the main types of products derived from hemp.
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Younas, Touseef, Noor Tayyaba, Afsheen Ayub et Shaukat Ali. « Textile fabric's and dyes ». Tekstilna industrija 69, no 3 (2021) : 47–59. http://dx.doi.org/10.5937/tekstind2103047y.
Texte intégralRésumé :
Textiles sectors serve up the outfit needs of every day and this industry plays a major role in the economy of the country. All the textile fabrics are either natural or synthetic fibers or a blend of both. Different types of dyes are used for different kinds of fabrics depending on the nature and type of the fabric to be dyed, to impart color, modify the fabric to make them more attractive and astonishing. In short, the introduction of synthetic dyes resulted in the demise of a massive natural dye industry. So, it's necessary to classify the different types of dyes with the increase in the number of types and varying dyeing properties so that this would be a best way to understand the different types of dyes, their applicability, fastness and other properties. In this article, a source for the beginners is provided to understand different kind of the textile fabrics and their importance as well as their drawbacks, dyes and their various types, their interaction with the corresponding fabric, their color strength and color fastness properties.
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Simion Beldean-Galea, Mihail, Florina-Maria Copaciu et Maria-Virginia Coman. « Chromatographic Analysis of Textile Dyes ». Journal of AOAC INTERNATIONAL 101, no 5 (1 septembre 2018) : 1353–70. http://dx.doi.org/10.5740/jaoacint.18-0066.
Texte intégralRésumé :
Abstract The textile industry uses many raw materials (natural and synthetic dyes and fibers) and different dyeing techniques that can be considered important pollutants with a negative impact on the environment (toxic working conditions, discharged wastewater, and contamination). Although synthetic dyes are intensively used, offer a wide range of colors and hues and properties of adhesion, longevity, and resistance to sunshine and chemical processes, and are cost-effective, they have begun to be restricted by many textile producers because they are nonbiodegradable and have toxic, carcinogenic, and mutagenic effects that generate some imbalances in plant, animal, and human life. Natural dyes of plant and animal origin exhibit very good tolerance to washing, rubbing, and light and are biodegradable and nontoxic; these properties have led to a call for the renewed use of these dyes. Modern analytical techniques (solid-phase extraction, spectrophotometry, HPLC, HPTLC, capillary electrophoresis) with different spectroscopy (UV-Vis, diode-array detection, pulsed amperometric detection) and/or MS/tandem mass spectrometry detectors have an important role in the textile industry in obtaining essential information about dyeing techniques, material origin, historical trade routes of ancient textiles, and environmental pollution. For this purpose, isolation, separation, and quantification methods of natural and synthetic textile dyes from various matrices (ancient and modern fabrics, water, biota, etc.) are presented.
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Parcesepe, Eliana, Rosa Francesca De Masi, Carmine Lima, Gerardo Maria Mauro, Maria Rosaria Pecce et Giuseppe Maddaloni. « Assessment of Mechanical and Thermal Properties of Hemp-Lime Mortar ». Materials 14, no 4 (12 février 2021) : 882. http://dx.doi.org/10.3390/ma14040882.
Texte intégralRésumé :
The use of renewable and natural materials characterized by the low environmental impact is nowadays a key issue for the sustainable development of the construction industry. For this reason, the interest for natural fibers, to be used as reinforcement in composites as an alternative to other fibers, is continuously growing. In this paper, the use of hemp for reinforcing lime mortar used as plaster is considered with a multidisciplinary approach, taking into consideration the structural and thermal performance. Natural fibers have several advantages compared to industrial ones, such as low cost, low environmental impact, biodegradability, renewable nature. Moreover, these can show remarkable mechanical performance in relation to specific weight, and sometimes, as in the case of hemp fibers, these can improve the thermal insulation capacity of the plaster. However, the experimental results on the mechanical features are still lacking, especially to assess their durability, and the variability of thermal parameters with the mechanical characteristics. Therefore, this paper proposes an experimental program, developed at Laboratory of Materials and Structures (LAMAS) of the University of Sannio (Italy), aimed at investigating the main mechanical properties (compression strength, flexural strength) of lime mortar reinforced by hemp fibers and subjected to various environmental exposures and aging processes. The characterization is completed with the measurement for the produced samples of the thermal conductivity by means of the standardized guarded hot plate technique.
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Del Savio, Alexandre Almeida Del, Darwin La Torre Esquivel, Flávio de Andrade de Andrade Silva et Joaquín Agreda Agreda Pastor. « Influence of Synthetic Fibers on the Flexural Properties of Concrete : Prediction of Toughness as a Function of Volume, Slenderness Ratio and Elastic Modulus of Fibers ». Polymers 15, no 4 (11 février 2023) : 909. http://dx.doi.org/10.3390/polym15040909.
Texte intégralRésumé :
The construction industry requires concrete with adequate post-cracking behavior for applications such as tunnels, bridges, and pavements. For this reason, polypropylene macrofibers are used, which are synthetic fibers that fulfill the function of providing residual strength to concrete. In this study, an experimental plan is carried out to evaluate the bending behavior of concrete reinforced with polypropylene fibers using the four-point bending test according to ASTM C1609. Three fiber dosages (3.6, 7.2 and 10.8 kg/m3) and three fiber lengths (40, 50, and 60 mm) were used. The use of macro polypropylene fibers increased the post-cracking behavior of concrete. In addition, based on the experimentally obtained results and available literature data, a multivariable equation was developed to predict the concrete toughness as a function of the volume, slenderness, and modulus of elasticity of the fibers. A Pearson’s correlation coefficient, r of 0.90, showed a strong correlation between the developed equation and the experimental data. From this equation, it was possible to determine the participation of the following parameters in calculating toughness. The participation or weight of the fiber’s modulus of elasticity on the concrete’s tenacity is 26%, the volume of the fiber is 39%, the slenderness is 19%, and the reinforcement index is 16%.
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Bem, Natani Aparecida do, Flávia Aparecida Reitz Cardoso, Edneia Aparecida de Souza Paccola et Luciana Cristina Soto Herek Rezende. « 3D-printed polylactic acid biopolymer and textile fibers : comparing the degradation process ». Revista Brasileira de Ciências Ambientais 57, no 2 (2022) : 302–19. http://dx.doi.org/10.5327/z2176-94781192.
Texte intégralRésumé :
With the advancement of sustainable actions in the textile industry, biodegradable polymers are considered a potential solution to environmental problems generated by plastic waste. In particular, renewable polyesters, such as polylactic acid (PLA), are the most promising bioresorbable materials for application in consumer areas, such as the textile industry, which is one of the largest segments responsible for waste generation. Based on these considerations, the objective was to investigate the degradability of 3D-printed PLA biopolymer, compared to the degradability of natural and synthetic textile fibers (cotton and polyester). The comparison was carried out with samples of materials degraded in soil and exposed to the weather for 120 days. Significant results were obtained for mass loss, as follows: 13.4% PLA; 8.9% cotton/flat, and 3.84% polyester/flat. As for the loss of area, the results were 46.5% for PLA; 15.4% for cotton/knit; and 6.25% for polyester/knit. The composition of the analyzed materials is one of the factors that can determine the period of degradation, since natural fiber fabrics present faster decomposition due to the presence of microorganisms. Another point to highlight is the material construction, as the knitted fabric is more unstable compared to flat fabric, its bonds tend to break more easily resulting in a different degradation process for flat, knit, and non-woven materials.
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Lenfeld, Petr, Pavel Brdlík, Martin Borůvka, Luboš Běhálek et Jiří Habr. « Effect of Radiation Crosslinking and Surface Modification of Cellulose Fibers on Properties and Characterization of Biopolymer Composites ». Polymers 12, no 12 (16 décembre 2020) : 3006. http://dx.doi.org/10.3390/polym12123006.
Texte intégralRésumé :
Recently, polymers have become the fastest growing and most widely used material in a huge number of applications in almost all areas of industry. In addition to standard polymer composites with synthetic matrices, biopolymer composites based on PLA and PHB matrices filled with fibers of plant origin are now increasingly being used in selected advanced industrial applications. The article deals with the evaluation of the influence and effect of the type of surface modification of cellulose fibers using physical methods (low-temperature plasma and ozone application) and chemical methods (acetylation) on the final properties of biopolymer composites. In addition to the surface modification of natural fibers, an additional modification of biocomposite structural systems by radiation crosslinking using gamma radiation was also used. The components of the biopolymer composite were a matrix of PLA and PHBV and the filler was natural cellulose fibers in a constant percentage volume of 20%. Test specimens were made from compounds of prepared biopolymer structures, on which selected tests had been performed to evaluate the properties and mechanical characterization of biopolymer composites. Electron microscopy was used to evaluate the failure and characterization of fracture surfaces of biocomposites.
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Moudood, Abdul, Anisur Rahman, Andreas Öchsner, Mainul Islam et Gaston Francucci. « Flax fiber and its composites : An overview of water and moisture absorption impact on their performance ». Journal of Reinforced Plastics and Composites 38, no 7 (11 décembre 2018) : 323–39. http://dx.doi.org/10.1177/0731684418818893.
Texte intégralRésumé :
Contemporary researchers have specified that natural flax fiber is comparable with synthetic fibers due to its unique physical and mechanical characteristics which have been recognized for decades. Flax fiber-reinforced composites have the potential for wide usage in sport and maritime industries, and as automotive accessories. In addition, this composite is in the development stages for future applications in the aeronautical industry. However, designing the flax composite parts is a challenging task due to the great variability in fiber properties. This is caused by many factors, including the plant origin and growth conditions, plant age, location in the stem, fibers extraction method, and the fact that there is often a non-uniform cross section of the fibers. Furthermore, the water and moisture absorption tendency of the flax fibers and their composites and the consequent detrimental effects on their mechanical performance are also major drawbacks. Fibers may soften and swell with absorbed water molecules, which could affect the performance of this bio-composite. Flax fibers’ moisture absorption propensity may lead to a deterioration of the fiber–matrix interface, weakening the interfacial strength and ultimately degrading the quality of the composite. This review represents a brief summary of the main findings of research into flax fiber reinforced composites, focusing on the challenges of its water and moisture absorption behavior on their performance.
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Peran, Jelena, et Sanja Ercegović Ražić. « Application of atmospheric pressure plasma technology for textile surface modification ». Textile Research Journal 90, no 9-10 (25 octobre 2019) : 1174–97. http://dx.doi.org/10.1177/0040517519883954.
Texte intégralRésumé :
This paper gives an overview of atmospheric pressure plasma types used in the textile industry and recent developments in plasma treatments of textiles. It investigates the topic of the influence of atmospheric pressure plasma treatment on the surface properties of materials made from natural and synthetic fibers. Through plasma induced physical and chemical reactions occurring in the textile surface layer, significant modifications in micromorphology and reactivity can be achieved. In addition to cleaning, etching, and activation, great efforts have been made in the development of plasma polymerization processes under atmospheric pressure. Utilization of atmospheric pressure plasma technology in the textile industry offers a new perspective on surface modification and functionalization. This paper gives a summary of textile properties achieved using plasma and the underlying processes based on relevant findings obtained from prominent research.