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Auswahl der wissenschaftlichen Literatur zum Thema „Sustainable biopolymers“
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Zeitschriftenartikel zum Thema "Sustainable biopolymers"
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Perera, Kalpani Y., Amit K. Jaiswal und Swarna Jaiswal. „Biopolymer-Based Sustainable Food Packaging Materials: Challenges, Solutions, and Applications“. Foods 12, Nr. 12 (20.06.2023): 2422. http://dx.doi.org/10.3390/foods12122422.
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Biopolymer-based packaging materials have become of greater interest to the world due to their biodegradability, renewability, and biocompatibility. In recent years, numerous biopolymers—such as starch, chitosan, carrageenan, polylactic acid, etc.—have been investigated for their potential application in food packaging. Reinforcement agents such as nanofillers and active agents improve the properties of the biopolymers, making them suitable for active and intelligent packaging. Some of the packaging materials, e.g., cellulose, starch, polylactic acid, and polybutylene adipate terephthalate, are currently used in the packaging industry. The trend of using biopolymers in the packaging industry has increased immensely; therefore, many legislations have been approved by various organizations. This review article describes various challenges and possible solutions associated with food packaging materials. It covers a wide range of biopolymers used in food packaging and the limitations of using them in their pure form. Finally, a SWOT analysis is presented for biopolymers, and the future trends are discussed. Biopolymers are eco-friendly, biodegradable, nontoxic, renewable, and biocompatible alternatives to synthetic packaging materials. Research shows that biopolymer-based packaging materials are of great essence in combined form, and further studies are needed for them to be used as an alternative packaging material.
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Soldo, Antonio, und Marta Miletic. „Durability against Wetting-Drying Cycles of Sustainable Biopolymer-Treated Soil“. Polymers 14, Nr. 19 (10.10.2022): 4247. http://dx.doi.org/10.3390/polym14194247.
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The world today is more oriented towards sustainable and environmental-friendly solutions in every field of science, technology, and engineering. Therefore, novel sustainable and eco-friendly approaches for soil improvement have also emerged. One of the effective, promising, and green solutions is the utilization of biopolymers. However, even though the biopolymers proved to be effective in enhancing the soil-mechanical properties, it is still unknown how they behave under real environmental conditions, such as fluctuating temperatures, moisture, plants, microorganisms, to name a few. The main research aim is to investigate the durability of biopolymer-improved soil on the cyclic processes of wetting and drying. Two types of biopolymers (Xanthan Gum and Guar Gum), and two types of soils (clean sand and silty sand) were investigated in this study. The results indicated that some biopolymer-amended specimens kept more than 70% of their original mass during wetting-drying cycles. During the compressive strength analysis, some biopolymer-treated specimens kept up to 45% of their initial strength during seven wetting-drying cycles. Furthermore, this study showed that certain damaged soil-biopolymer bonds could be restored with proper treatment. Repeating the process of wetting and drying can reactivate the bonding properties of biopolymers, which amends the broken bonds in soil. The regenerative property of biopolymers is an important feature that should not be neglected. It gives a clearer picture of the biopolymer utilization and makes it a good option for rapid temporary construction or long-standing construction in the areas with an arid climate.
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Nazrun, Touha, Md Kamrul Hassan, Md Delwar Hossain, Bulbul Ahmed, Md Rayhan Hasnat und Swapan Saha. „Application of Biopolymers as Sustainable Cladding Materials: A Review“. Sustainability 16, Nr. 1 (19.12.2023): 27. http://dx.doi.org/10.3390/su16010027.
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The application of biopolymer materials in cladding presents a promising avenue for enhancing building sustainability, while addressing the limitations of conventional synthetic polymers. Cladding serves a dual purpose of protection and aesthetics for buildings, but increasing global energy consumption and environmental concerns necessitate the adoption of sustainable practices. The construction sector’s substantial energy usage and greenhouse gas emissions highlight the urgent need for sustainable building materials. Conventional cladding materials often lack sustainability and environmental compatibility. Biopolymers, derived from living organisms or by-products, offer a potential solution with their biodegradability, renewability, and low embodied energy. These materials can revolutionise cladding practices by providing eco-friendly alternatives aligned with sustainable construction demands. Integrating biopolymers with synthetic polymers can enhance material biodegradability, contributing to overall degradation. Prominent biopolymers like PLA, PHAs, starch-based polymers, cellulose, PHB, and PBS exhibit biodegradability and sustainability, positioning them in the front rank for cladding applications. Despite significant research in biopolymer applications in different fields, there is limited research to identify the application and limitations of biopolymers as building cladding materials. This review paper aims to bridge the research gaps by comprehensively analysing diverse biopolymer cladding materials based on their properties and exploring their cross-domain utility, thereby highlighting their transformative role in sustainable construction practices. The expanding biopolymer market in building cladding materials underscores their potential to drive innovation, with projected growth emphasising their importance.
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MAAN, SHEETAL, ANUSHREE JATRANA, VINAY KUMAR, MEENA SINDHU und SANCHIT MONDAL. „Chlorpyrifos Release Kinetics from Citric Acid Crosslinked Biopolymeric Nanoparticles: A Sustainable Approach“. Asian Journal of Chemistry 35, Nr. 11 (31.10.2023): 2822–28. http://dx.doi.org/10.14233/ajchem.2023.30755.
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Biopolymer based nanoformulation was synthesized by using microwave assisted nano-precipitaion method. The biopolymers consist of chitosan and guar gum were crosslinked using citric acid in order to encapsulate chlorpyrifos pesticide. The successful synthesis of chlorpyrifos containing nano-formulations was thoroughly examined, where the surface morphology examined by using field emission scanning electron microscopy (FE-SEM) has established the loading of chlorpyrifos in the biopolymeric matrix, transmission electron microscopy (TEM) examination revealed the spherical shaped particles of about 234 nm and Fourier-transform infrared spectroscopy (FTIR) analysis has confirmed the crosslinking between two biopolymers through citric acid due to the presence of peaks corresponding to ester linkages at 1730 cm-1. The encapsulation efficiency of chlorpyrifos at pH 7 and 30 ºC was around 50%. The successfully synthesized chlorpyrifos loaded biopolymeric nano-formulation were further utilized to study the release behaviour of chlorpyrifos in water and biocompatibility towards soil microbiota. The release of chlorpyrifos was almost 15% slower than conventional chlorpyrifos and the formulation was found biocompatible towards microbiota.
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Baranwal, Jaya, Brajesh Barse, Antonella Fais, Giovanna Lucia Delogu und Amit Kumar. „Biopolymer: A Sustainable Material for Food and Medical Applications“. Polymers 14, Nr. 5 (28.02.2022): 983. http://dx.doi.org/10.3390/polym14050983.
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Biopolymers are a leading class of functional material suitable for high-value applications and are of great interest to researchers and professionals across various disciplines. Interdisciplinary research is important to understand the basic and applied aspects of biopolymers to address several complex problems associated with good health and well-being. To reduce the environmental impact and dependence on fossil fuels, a lot of effort has gone into replacing synthetic polymers with biodegradable materials, especially those derived from natural resources. In this regard, many types of natural or biopolymers have been developed to meet the needs of ever-expanding applications. These biopolymers are currently used in food applications and are expanding their use in the pharmaceutical and medical industries due to their unique properties. This review focuses on the various uses of biopolymers in the food and medical industry and provides a future outlook for the biopolymer industry.
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Patel, Nidhiben, und Dagnija Blumberga. „Insights of Bioeconomy: Biopolymer Evaluation Based on Sustainability Criteria“. Environmental and Climate Technologies 27, Nr. 1 (01.01.2023): 323–38. http://dx.doi.org/10.2478/rtuect-2023-0025.
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Abstract Sustainable development in the agriculture sector can be boosted by integrating a sustainable bioeconomy and transforming renewable resources into added-value products. There are various methods to determine, measure, and compare the extent of sustainability. We promote the bioeconomy concept by utilizing agricultural waste in biopolymers considering the sustainable development in the agriculture sector. This research aims to evaluate biopolymer alternatives based on sustainability criteria and indicators using the integrated multi-criteria decision analysis approach under the sustainability umbrella. We evaluated the PLA, PHA/PHB, starch, protein, and cellulose-based biopolymers. As a result, the cellulose-based biopolymer shows the best performance. The research findings provide valuable information to establish a sustainable pathway for biopolymer production for industries.
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Kumar, M. Ashok, Arif Ali Baig Moghal, Kopparthi Venkata Vydehi und Abdullah Almajed. „Embodied Energy in the Production of Guar and Xanthan Biopolymers and Their Cross-Linking Effect in Enhancing the Geotechnical Properties of Cohesive Soil“. Buildings 13, Nr. 9 (10.09.2023): 2304. http://dx.doi.org/10.3390/buildings13092304.
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Traditional soil stabilization techniques, such as cement and lime, are known for their menacing effect on the environment through heavy carbon emissions. Sustainable soil stabilization methods are grabbing attention, and the utilization of biopolymers is surely one among them. Recent studies proved the efficiency of biopolymers in enhancing the geotechnical properties to meet the requirements of the construction industry. The suitability of biopolymer application in different soils is still unexplored, and the carbon footprint analysis (CFA) of biopolymers is crucial in promoting the biopolymers as a promising sustainable soil stabilization method. This study attempts to investigate the out-turn of cross-linked biopolymer on soils exhibiting different plasticity characteristics (Medium & High compressibility) and to determine the Embodied carbon factor (ECF) for the selected biopolymers. Guar (G) and Xanthan (X) biopolymers were cross-linked at different proportions to enhance the geotechnical properties of soils. Atterberg’s limits, Compaction characteristics, and Unconfined Compressive Strength were chosen as performance indicators, and their values were analyzed at different combinations of biopolymers before and after cross-linking. The test results have shown that Atterberg’s limits of the soils increased with the addition of biopolymers, and it is attributed to the formation of hydrogels in the soil matrix. Compaction test results reveal that the Optimum Moisture Content (OMC) of biopolymer-modified soil increased, and Maximum Dry Density (MDD) reduced due to the resistance offered by hydrogel against compaction effort. Soils amended with biopolymers and cured for 14, 28, and 60 days have shown an appreciable improvement in Unconfined Compressive Strength (UCS) results. Microlevel analysis was carried out using SEM (Scanning Electron Microscopy) and FTIR (Fourier-transform infrared spectroscopy) to formulate the mechanism responsible for the alteration in targeted performance indicators due to the cross-linking of biopolymers in the soil. The embodied energy in the production of both Guar and Xanthan biopolymers was calculated, and the obtained ECF values were 0.087 and 1.67, respectively.
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Annu, Annu, Mona Mittal, Smriti Tripathi und Dong Kil Shin. „Biopolymeric Nanocomposites for Wastewater Remediation: An Overview on Recent Progress and Challenges“. Polymers 16, Nr. 2 (21.01.2024): 294. http://dx.doi.org/10.3390/polym16020294.
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Essential for human development, water is increasingly polluted by diverse anthropogenic activities, containing contaminants like organic dyes, acids, antibiotics, inorganic salts, and heavy metals. Conventional methods fall short, prompting the exploration of advanced, cost-effective remediation. Recent research focuses on sustainable adsorption, with nano-modifications enhancing adsorbent efficacy against persistent waterborne pollutants. This review delves into recent advancements (2020–2023) in sustainable biopolymeric nanocomposites, spotlighting the applications of biopolymers like chitosan in wastewater remediation, particularly as adsorbents and filtration membranes along with their mechanism. The advantages and drawbacks of various biopolymers have also been discussed along with their modification in synthesizing biopolymeric nanocomposites by combining the benefits of biodegradable polymers and nanomaterials for enhanced physiochemical and mechanical properties for their application in wastewater treatment. The important functions of biopolymeric nanocomposites by adsorbing, removing, and selectively targeting contaminants, contributing to the purification and sustainable management of water resources, have also been elaborated on. Furthermore, it outlines the reusability and current challenges for the further exploration of biopolymers in this burgeoning field for environmental applications.
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Ahmad, Noormazlinah, Abdurahman Nour Hamid und Adil M. Osman. „A Review Study on the Potential of Microalgae Biomass Producing Biopolymer Material“. Current Science and Technology 2, Nr. 2 (15.06.2023): 49–55. http://dx.doi.org/10.15282/cst.v2i2.9413.
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This review focuses on the potential of microalgae biomass in producing biopolymer materials. Microalgae have gained attention as a sustainable and renewable source of energy and other useful products such as biofuels, pharmaceuticals, and cosmetics. One promising application of microalgae is as a source of biopolymers, which can be used as a sustainable alternative to traditional petroleum-based plastics. The review is conducted through a comprehensive search of electronic databases, screening of relevant articles, and synthesis of information obtained from the selected studies. The review also critically evaluates the strengths and limitations of the existing research on the potential of microalgae biomass in producing biopolymer materials. The outcomes in this review highlights key findings related to the potential applications of microalgae biomass in producing biopolymers and identifies areas for future research. The conclusions and recommendations of this review are important for guiding the development of sustainable and environmentally friendly biopolymer materials.
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Lemboye, Kehinde, und Abdullah Almajed. „Effect of Varying Curing Conditions on the Strength of Biopolymer Modified Sand“. Polymers 15, Nr. 7 (28.03.2023): 1678. http://dx.doi.org/10.3390/polym15071678.
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Recently, the improvement of the engineering properties of soil has been centered on using sustainable and eco-friendly materials. This study investigates the efficacy of three biopolymers: Acacia, sodium alginate, and pectin, on the unconfined compressive strength (UCS) of dune sand. The UCS test measured the effects of the biopolymer type and concentration, curing intervals and temperature, and moisture loss. The changes in the morphology caused by the biopolymer addition were examined via scanning electron microscopy (SEM). Results indicate that the UCS of the biopolymer-modified sand increased with biopolymer concentration and curing intervals. Varying the curing temperature from 25–110 °C, slightly affected the strength of the acacia-modified sand specimen, increased that of the sodium alginate-modified sand specimen up to a temperature of 85 °C, and continued to decrease that of the pectin-modified sand specimen as the temperature was increased from 25 to 110 °C. The SEM images indicated that the biopolymer’s presence within the sand pores significantly contributed to the strength. Bond decomposition occurs at temperatures greater than 110 °C for sodium alginate and pectin-modified sands, whereas bonds remain stable at higher temperatures for the acacia-modified sand. In conclusion, all three biopolymers show potential as robust and economic dune stabilisers.
Dissertationen zum Thema "Sustainable biopolymers"
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Whitelaw, Emma L. „Catalysts for the production of sustainable biopolymers“. Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577145.
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The development of biodegradable plastics from sustainable sources is at the forefront of chemical research. One such example is the production of polylactide (PLA) via the ring-opening polymerisation (ROP) of the cyclic ester lactide (LA). Current industrial metal initiators utilised for the ROP of LA do not allow control over the stereochemistry of the resulting product. This thesis will investigate various initiators containing a variety of ligand sets for the ROP of rac-LA. Chapter 1 introduces the ROP of rac-LA, the mechanisms utilised and the methods employed for characterisation of PLA. A review of the current literature of recent developments in the production of PLA via various metal initiators is also included. Chapter 2 reports the development of a series of group (IV) complexes containing various amine tris(phenolate) ligands, where the sterics and electronics have been varied. Such complexes were trialled for the ROP of rac-LA as well as the ROP of trimethylene carbonate (TMC). The ability of such initiators to produce copolymers of rac-LA/TMC and rac-LA/isosorbide was also investigated and discussed. Chapter 3 describes the synthesis of a range of group (IV) complexes containing Salalen ligands. The sterics of the ligands have been varied and the ability of the initiators to initiate the ROP of rac-LA in a stereocontrolled fashion has been investigated. Furthermore, the complexes have been trialled for the degradation of PLA into methyl lactate, an important starting material in the production of LA. Chapter 4 investigates the development of Al(III) Salalen complexes for the ROP of rac-LA, where the sterics and electronics of the ligand have been varied. Kinetic investigations have been carried out to aid the understanding of the polymerisation process. Chapter 5 provides details of the reaction procedures for the synthesis of ligands, complexes and polymers. Kinetic procedures are also reported together with details of the analytical techniques employed.
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Taddei, Lorenzo, F. Ugolini, G. P. Bonino, G. Giacomelli, C. Franceschi, M. Bertoldini, R. Sole und V. Beghetto. „Biopolymers for a more sustainable leather -154“. Verein für Gerberei-Chemie und -Technik e. V, 2019. https://slub.qucosa.de/id/qucosa%3A34185.
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Content:
A novel class of bio-based polymers have been developed within the LIFE BIOPOL European project aiming to replace traditional re-tanning and fat-liquoring products reducing environmental impacts and increasing the safety of leather.
The purpose of the project is to enhance the recovery and reuse of different bio-derived by-products from leather and agro-industrial sector to produce eco-friendly and renewable bio-polymers with high re-tanning and fat-liquoring characteristics.
The LIFE BIOPOL project aims to make bio-based polymers in order to reduce the following parameters in re-tanning phase:
- 20-30% COD,
- 50-60% of inorganic salts (Sulphates and Chlorides),
- 90% of Cr (III) salts,
- 20% of water used in the leather process.
Other important goals of the project are:
- reduction 70-90% of hazardous and environmental polluting substances normally found in conventional chemicals,
- reactivity enhancement of 30-40% of the new biopolymers compared to the current leather
- application technology,
- reduction of 70-80% of the Product Environmental Footprint of the new biopolymers related to the state of the art.
The vegetal biomasses and the tanned hides by-products were pretreated in order to obtain suitable building blocks for the production of bio-based polymers. Several protocols involving polymerization were
used in order to achieve the synthesis of the biopolymers, which have been carried out at lab scale.
Macromolecular characterization of the biopolymers was performed in order to rationalize the synthetic strategy and practical application of the products giving important parameters such as molecular weight
and chemical composition of the new biopolymers.
Performances of new bio-based polymers have been inspected and compared with traditional chemicals through application on different types of leather. The benefits of the new products within leather making process were evaluated through chemical analyses of re-tanning and fat-liquoring effluents.
The upgrade of the developed chemistry will be performed within a new devised prototype plant specifically designed and built-up for producing the bio-based polymers at industrial scale
Take-Away:
Production of leather making biopolymers from biomasses and industrial by-products through Life Cycle Designed Processes
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Catani, Linda. „Development and Characterization of Biopolymers“. Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20761/.
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Development and characterization of biopolymers was done in AIJU’s laboratories. AIJU, Technological Institute for children’s products and leisure is based in Spain. The work has the aim to study qualities and characteristics of bioplastics’ blends, in order to design where improvements can be executed. Biopolymers represent a sector with great development possibilities because they combine high technical potential and eco-sustainability. Nowadays, plastic pollution has becoming increasingly concerning, particularly in terms of management of waste. Bioplastics provide an alternative for the disposal of products, reducing the volume of waste and enhancing the end of life recovery. Despite the growing interest in biopolymers there is some gaps that need be filled. The main objective on this work, is the optimization of bioplastics mechanical properties, to find suitable substitutes, as similar as possible to conventional plastics. Firstly, investigations on processability of biomaterials has been deepen since the project deals with toy manufacturing’s sector. Thus, starting from laboratory scale the work aspires to expand industrially. By working with traditional machines, it was notable that, with some limited modifications, the equipment can perform the same functions. Therefore, operational processes do not emerge as an obstacle to the production chain.
Secondly, after processing bio-blends, they are characterized by thermal tests (melt flow index, differential scanning calorimetry-DSC, thermogravimetry-TGA) and mechanical tests (traction and flexural tests, Charpy impact, SHORE D hardness and density). While the compatibility does not show relevant results, mechanical improvements has been visualized with addition of more ductile materials. The study was developed by inclusion of sustainable additive VINNEX® to blends. The thesis has highlighted that integration of more flexible materials provides elasticity without compromising bioplastics’ properties.
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Colwill, James. „A framework for supporting the sustainable adoption of biopolymers in packaging applications“. Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12820.
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This thesis reports on the research undertaken to investigate the reduction of the environmental impacts of plastic packaging through the effective selection and application of biopolymers during the pack design process. The principle objective of this research is to develop an understanding of the strengths and weaknesses of biopolymers as a packaging material and to develop a framework which enables biopolymers to be considered at each stage of the pack design process to enable their effective and appropriate selection and use.
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Martino, Francesca. „Study of the absorption of organic compounds on biopolymers“. Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24929/.
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This work has been conducted in order to determine the solubility and diffusion coefficients of different aromatic substances in two different grades of polylactic acid (PLA), Amorphous (PDLLA) and Crystalline (PLLA); in particular the focus is on the following terpenes: Linalool, α-Pinene, β-Citronellol and L-Linalool. Moreover, further analyses have been carried out with the aim to verify if the use of neat crystalline PLA, (PLLA), a chiral substrate, may lead to an enantioenrichment of absorbed species in order to use it as membrane in enantioselective processes. The other possible applications of PLA, which has aroused interest in carry out the above-mentioned work, concerns its use in food packaging. Therefore, it is interesting and also very important, to evaluate the barrier properties of PLA, focusing in particular on the transport and absorption of terpenes, by the packaging and, hence, by the PLA. PLA films/slabs of one-millimeter thickness and with square shape, were prepared through the Injection Molding process.
On the resulting PLA films heat pretreatment processes of normalizing were then performed to enhance the properties of the material. In order to evaluate solubility and diffusion coefficient of the different penetrating species, the absorption kinetics of various terpenes, in the two different types of PLA, were determined by gravimetric methods. Subsequently, the absorbed liquid was extracted with methanol (MeOH), non- solvent for PLA, and the extract analyzed by the use of High Performance Liquid Chromatography (HPLC), in order to evaluate its possible enantiomeric excess. Moreover, PLA films used were subjected to differential scanning calorimetry (DSC) which allowed to measure the glass transition temperature (Tg) and to determine the degree of crystallinity of the polymer (Xc).
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Zhang, Qiang. „Chain conformation of cellulose, a sustainable biopolymer, and its derivatives in ionic liquid studied by small-angle neutron and X-ray scattering“. Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASF075.
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La cellulose, un biopolymère renouvelable, peut remplacer les matériaux non biodégradables dans les applications industrielles. Elle est d'abord dissoute, puis transformée (par exemple en fibres) et enfin « régénérée » (recristallisation par ajout d'eau). Cependant, la dissolution de la structure cristalline très stable nécessite des solvants agressifs et polluants, au contraire des liquides ioniques (IL). Cette thèse étudie le processus de dissolution et l'état dissous pour deux liquides ioniques sélectionnés comme solvants efficaces. Nous étudions la structure et la conformation des chaînes de cellulose par la diffusion des rayons X et des neutrons. Les signaux sont très faibles (< 1 cm⁻¹), en raison de la forme fine des bâtonnets, du faible contraste et de la difficulté à mesurer en raison de la grande sensibilité à l'eau. Le chapitre 1 résume l'état de l'art sur les solutions dans des solvants industriels et dans les liquides ioniques, et sur les études de diffusion, de la lumière, des rayons X et des neutrons, montrant des situations diverses. Le chapitre 2 présente la préparation des échantillons et les techniques. Le chapitre 3 présente des études de Diffusion des rayons X aux Petits Angles (DXPA), réalisées à l'aide de spectromètres sur synchrotron, à flux élevé et à faisceau étroit. Nous avons d'abord étudié la cellulose microcristalline (MCC, degré de polymérisation DP = 200 unités) dans deux IL à base de butyl-méthyl-imidazolium : acétate (BmimAc) ou chlorure (BmimCl). Différents régimes sont attendus à partir d'études rhéologiques. - Dans le régime dilué (0,005 - 0,02 g/g). La diffusion est ajustée au facteur de forme P(q) d'une chaîne en forme de bâtonnet, entourée d'une coquille de densité différente de celle du solvant, avec éventuellement une grande longueur de persistance (> 7 nm). - Pour des concentrations plus importantes, dans des cas encore bien dissous, un facteur de structure révèle des répulsions inter-chaînes faibles, sans alignement fort. - A des concentrations plus élevées, la diffusion suggère une séparation de phase liquide-liquide. - Enfin, aux concentrations les plus élevées, des cristaux non dissous sont détectés à grand q (WAXS), un grand avantage de notre technique. La coexistence avec les cristaux a été étudiée pendant le gonflement de films ou de fibres de cristaux de nanocellulose, par balayage en faisceau étroit d'un gradient de concentration. L'effet d'un faible pourcentage d'eau ajoutée a été testé, les Il bons solvants étant assez hygroscopiques. Au-delà de quelques pour cent d'eau, une diffusion beaucoup plus forte suggère de fortes fluctuations de concentration, ou une structure biphasique, utile pour comprendre les premières étapes de la « régénération » (recristallisation) par ajout d'eau. Les courbes de diffusion de cellulose d'autre origine et de poids moléculaire également faible (rayonne, nanocristaux - CNC) sont similaires à celles du MCC. Celle de la cellulose bactérienne montre aussi une identité complète à l'échelle locale, mais avec des agrégats indépendants visibles aux moyens q. Le chapitre 4 présente les mesures : - de Diffusion des Neutrons aux Petits Angles (DNPA) aux faibles concentrations, le profil de DNPA est celui de la DXPA, ce qui permet une évaluation complémentaire des densités de longueur de diffusion. Par extrapolation à la fraction zéro de cellulose deutérée, nous avons tenté d'extraire la fonction intra-chaîne S₁(q)~P(q), et la fonction inter-chaîne S₂(q). Des difficultés sont apparues à faible q en raison de la forte remontée de la cellulose deutériée bactérienne. A q élevé il y a accord avec la DXPA. - de Diffusion de Neutrons aux Grands Angles (DNGA) suit les corrélations à courte échelle. Nous avons effectué différentes deutériations : soit le cation Bmim, soit l'anion Ac, soit les deux. Par comparaison nous discutons de l'absorption possible des anions acétate sur les chaînesCellulose, a renewable bio-polymer, can replace non-biodegradable materials in various technological applications. Industrially, it is first dissolved, then processed (e.g. by spinning), and finally “regenerated” (recrystallization by adding water). However, dissolution from the very stable crystal structure requires harsh, pollutant solvents for individual chains to stay in solution. Ionic liquids (ILs) have emerged as non - polluting effective solvents. This thesis aims at the dissolution process and dissolved state checking how the two selected ILs are successful solvents, which is controversial. Our approach is to study structure and conformation of cellulose chains by X-Ray and neutron scattering, which are very weak (< 1 cm⁻¹), due to the small volume of the thin rod, the low contrast and difficult to measure due to high sensitivity to water. Chapter 1 summarizes the state of the art on solutions of cellulose in different widely industrially used solvents, in ionic liquids, and in scattering studies, light, X-rays and neutrons, showing various states of dispersion. Chapter 2 presents the preparation of the samples and the techniques. Chapter 3 reports Small Angle X rays Scattering (SAXS) studies, using high flux and narrow beam synchrotron spectrometers. We first monitored MicroCrystalline Cellulose (MCC, Degree of Polymerisation DP ≈ 200 units) in two Butyl-methyl-imidazolium based ILs: acetate (BmimAc), or Chloride (BmimCl). Different regimes are assumed from rheological studies. -In the dilute regime (0.005 – 0.02 g/g). Scattering is fitted to the form factor P(q) of a rod-like chain, surrounded by a shell of density different from the one of the solvent, with possibly a large persistence length (> 7 nm). -For larger concentrations, in yet well dissolved cases, a structure factor unveils soft interchain repulsions, without strong alignment. -At higher concentration, the scattering suggests a liquid-liquid phase separation -Finally, at the highest concentrations, non-dissolved crystals are detected at large q (WAXS), a great advantage of our technique. The coexistence with crystals was also investigated during swelling in nanocellulose crystals films or fibers, through narrow beam scanning of a concentration gradient. The effect of a small percentage of added water was tested, the IL good solvents for cellulose being quite hygroscopic. Above a few per cent of water, much stronger scattering suggests strong concentration fluctuations, or biphasic structure, useful to understand the first stages of the “regeneration” (recrystallization) step performed by adding water, to obtain the final products. Cellulose of other origin and similarly small molecular weights (in rayon, and CNC), superimpose their scattering on the one of MCC. Bacterial cellulose scattering superposes only at large q (hence a complete identity at local scale), but shows an additional strong low q upturn, due to independent aggregates. This opens the way to neutron scattering experiments using deuteriated cellulose, which is available only in a bacterial form. Chapter 4 reports the measurements of: -Small Angle Neutron Scattering (SANS) shows for low concentrations a profile similar to SAXS, allowing a complementary evaluation of the Scattering Length Density of cellulose. Using extrapolation at Zero Deuteriated Cellulose Fraction, we attempted the extraction of the intrachain function S₁(q)~P(q), the interchain function S₂(q). Difficulties appeared at low q due to the strong upturn, while high q showed agreement with the SAXS measurement of the form factor below c*. -Wide Angle Neutron Scattering (WANS) was used to track the correlations at short scale. Different solvents were used in which either the Bmim cation, or the anion Ac, or both, were deuteriated using our own synthesis processes. Comparisons enable us to discuss about possible absorption of the acetate anions on the cellulose chains
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Jesus, Sónia Alexandra Rodrigues. „Novas bases texteis para novas exigências sociais. A sustentabilidade das fibras sintéticas“. Master's thesis, Faculdade de Arquitectura de Lisboa, 2011. http://hdl.handle.net/10400.5/4710.
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Tese de Mestrado em Design de ModaA moda é um mecanismo veloz, efémero e sôfrego de novi¬dade. Ao longo da história da moda e do design, os têxteis têm sido intimamente relacionados com a inovação a nível científico e industrial. Actualmente, as novas exigências sociais e a evolução tec¬nológica permitem a concepção de ideias e materiais nunca antes imaginados. Alega-se que o vestuário se está a transformar na expressão de um estilo de vida consciencioso e de uma personalida¬de onde coexistem preocupações com o ambiente e com a individualidade, e a realização de desejos e necessidades humanas. Deste modo, é crucial a investigação de soluções para novas bases têxteis que correspondam às exigências de sustentabilidade, funcionalidade e estética, quer do consumi¬dor quer do designer de moda. Em conformidade, este trabalho de investigação foca a análise de algumas fibras têxteis naturais e manufactura¬das, sob o ponto de vista das suas propriedades, aplicações e processamento, procurando esclarecer e desmitificar o carácter ecológico de ambas. Em consonância, é feita a aná¬lise comparativa do processamento do algodão e do lyocel, permitindo observar a existência de novas fibras manufactu¬radas que se apresentam como uma alternativa sustentável para a produção de novas bases têxteis para produtos de moda. Desta forma, a presente dissertação pretende realçar o carácter sustentável de novas bases têxteis, desmitifican¬do o carácter ecológico de algumas fibras naturais, como o algodão, face à carga poluente que advém do seu processo de tranformação.
ABSTRACT - Fashion is fast, ephemerous and longs for innovation. Throu¬ghout the history of both fashion and design, textiles have been intimately connected with scientific and industrial inno¬vation. Nowadays, new social demands and technological evolu¬tion have allowed a conception of ideas and materials never imagined before. It is alleged that clothing is becoming the voice of a conscien¬tious lifestyle and of a personality where environmental and individuality concerns, human needs and the fulfillment of desires all coexist. As such, it is crucial to explore new textile structures so¬lutions that correspond to the demands for sustainability, functionality and aesthetics of both the fashion designer and the consumer. Accordingly, this research study focuses on the analysis of the properties, applications and processing of some natural and manufactured textile fibers, looking forward to enlighten and demystify their ecological character. In consonance, a comparative analysis of cotton and lyocell processing has been done, allowing the observation of the existence of new manufactured fibers that can be envisaged as a sustainable alternative for the production of new textile structures for fashion products. Hence, this dissertation aims to highlight the sustainable character of these new textile structures, demystifying the ecological character of some natural fibers, such as cotton, when confronted with the pollution that re¬sults from its transformation process.
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Gransinigh, Sara. „Research and development of manufacturing protocols and new binders for the industrial production of bio-composites materials“. Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24404/.
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Within the scope of moving towards a circular economy, “green” materials surely represent an excellent alternative, both in terms of sustainable manufacturing process and circular lifespan. For instance, “bio-composites” are promising bio-based materials constituted by bio-polymers or bio-derived polymers that are reinforced by natural fibres or biological wastes and/or residues. The present Internship and Thesis project took place at Mogu S.r.l., a small Italian company (VA) that creates responsible products for interior design. In details, it focused on the production process of bio-composites tiles for flooring from agro-industrial residues like hemp-shives. The current production protocol was firstly implemented through the investigations of macro-variables: particles’ size and distribution, alternative fibres, different %/dry weight of kraft lignin as binder, temperature and pressure, density and thickness. This allowed to cut by almost 38% the total manufacturing time and reduce the amount of bio-adhesive, thus improving the overall sustainability of the process. Then, alternative bio-adhesives have been tested both in a pure form and after pre-treatments. Precisely, some experimental procedures have been developed to denaturise soy and whey proteins, on the basis of methodologies reported in literature. Finally, the most promising bio-composites were further characterized by performing some mechanical tests. Particularly, the tiles with thermally activated whey proteins isolates as binder showed the best flexural properties, far above the threshold values set by norms. Conversely, further studies will be needed to improve panels’ dimensional stability since also the lowest value of swelling in thickness, recorded for panels with kraft lignin and thermally pre-treated, was not in compliance with norms. Nevertheless, the Project confirmed that it is feasible to reach interesting properties with natural components coming from leftovers of several industries.
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Oliveira, Flávia Natalino. „Evaluation of sustainable biopolymer as depressant for iron ore cationic reverse flotation“. Universidade Federal de Viçosa, 2014. http://www.locus.ufv.br/handle/123456789/9695.
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A flotação catiônica reversa do minério de ferro é um processo de separação usado na mineralogia para separar compostos de ferro de outros compostos indesejáveis presentes no minério de ferro. Nesse processo, o amido é usado como depressor e amina como coletor. A compreensão do mecanismo de interação existente entre os reagentes usados no processo de flotação e o minério de ferro é de fundamental importância para avanços na tecnologia de enriquecimento de minério de ferro, bem como no desenvolvimento de novos agentes químicos usados no processo para esse fim. Esse trabalho está dividido em dois capítulos: i) O primeiro tem como principal objetivo avaliar algumas características do amido que podem influenciar no processo de flotação, como, tamanho da cadeia polimérica e grupo terminal redutor (GTR) presentes na molécula do depressor e ainda avaliar, por meio de técnicas espectroscópicas os minérios flotados e afundados dos testes de flotação usando dextrina, amido solúvel, amido ceroso e amido de milho industrial como agentes depressores. ii) O segundo capítulo tem como principal objetivo desenvolver um novo depressor (XMC), extraído de resíduo de fibra de milho, para substituir o amido no processo de flotação do minério de ferro. Os estudos do capítulo 1 mostraram que moléculas de amido menores resultam piores desempenhos na flotação e que a presença do GTR começa a ser positivamente influente no desempenho da flotação quando se usa moléculas pequenas, em que esse grupo está em maiores quantidades (DE = 10,6% glicose). Uma análise dos espectros de DRIFT baseada na intensidade da banda da hematita não mostrou nada além de que as amostras de concentrado contém mais hematita que as amostras de flotado, como já era esperado. A análise de espectroscopia Raman não possibilitou a observação de qualquer banda característica dos depressores usados, uma vez que só foi sensível à fase inorgânica. Os estudos do capítulo 2 mostraram o grande potencial da XMC em substituição ao amido no processo de flotação, por excelentes resultados de flotação e por ser uma alternativa sustentável, oferecendo uma destinação nobre a um resíduo industrial. Além da possibilidade em remover o amido parcial ou totalmente do processo industrial, preservando-o para a cadeia alimentar humana e animal.
The reverse cationic flotation of iron ore is a separation process used in mineralogy to separate iron compounds from others compounds present in iron ore. In this process, the starch is used as depressant and amine as collector. The knowledge of interaction mechanism between the reagents used in the flotation process and iron ore has a fundamental importance to advance iron ore enrichment technology, as well as to the development of new chemicals used in the process. This work is divided into two chapters: i) The first chapter aims to evaluate some characteristics of starch that can influence the flotation process, such as, size of the polymer chain and reducing end group (REG) present in the depressant molecule. It also aims to evaluate, by spectroscopic techniques, the reject and concentrate minerals from flotation tests using dextrin, soluble starch, waxy starch and industrial corn starch as depressant agents. ii) The second chapter aims to develop a new depressant (XMC), extracted from corn fiber residue (CFR), to replace the starch in iron ore flotation process. The results in Chapter 1 showed that short chain depressant results in worse flotation performance. The amount of REG has no effect on flotation performance up to a dextrose equivalent value of 9.2% glucose. Analysis of the DRIFT spectra based on the intensity of the hematite band only showed the concentrate samples contain more hematite than reject samples, as expected. Using Raman spectroscopy analysis, it was not possible to observe any characteristic band of the depressants used, since the Raman was only sensitive to inorganic phase. The studies in Chapter 2 showed the great potential of XMC replacing starch in flotation process, because of the excellent flotation results and the XMC be a sustainable alternative, offering a prime destination to an industrial waste. Besides, it is possible to remove the starch of industrial process partially or totally, preserving it for human and animal food chain.
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Cot, Gores Jaume. „Recycling of Wastes and Thermal Energy Storage, Two Different Ways to Improve Our Environment“. Doctoral thesis, Universitat de Lleida, 2012. http://hdl.handle.net/10803/81419.
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Aquesta tesi és una contribució a generar una economia eficient en recursos i energia per mitjà de reccions químiques. En concret, la memòria presenta d’una banda, un procés ràpid i eficaç per a la recuperació de les sals de crom(III) i l'obtenció de biopolimers d'alt valor afegit dels residus cromats procedents de la indústria d’adoberia. El procés de descromació està basat en l'oxidació del crom(III) a crom(VI) utilitzant peròxid d’hidrogen en mitjà bàsic. A més, la mateixa reacció d'oxidació es va utilitzar per recuperar les sals de crom(IIII) dels efluents cromats. D’altra banda, les reaccions termoquímiques (processos d’adsorció química i les reaccions químiques sòlid-gas) obren una nova possibilitat per l’emmagatzematge tèrmic d’energia solar durant períodes llargs de temps en zones residencials. Aquest treball aporta una revisió sobre la investigació experimental de sistemes d’emmagatzematge tèrmic mitjançant materials termoquímics (TCM). A més, la memòria aporta el treball realitzat per a la caracterització experimental del MgSO4•7H2O, Al2(SO4)3•18H2O, CaCl2•2H2O and MgCl2•6H2O per la determinació de la seva aplicació com a TCM en un sistema estacional d’emmagatzematge tèrmic solar. Els resultats experimentals van indicar que els clorurs poden alliberar calor al sistema de calefacció residencial a temperatures més altes que els sulfats.Esta tesis es una contribución a generar una economía eficiente en recursos y energía por medio de reacciones químicas. En particular esta memoria presenta por una parte, un proceso rápido y eficaz para la recuperación de las sales de cromo(III) y la obtención de biopolímeros de alto valor añadido de los residuos cromados provenientes de la industria del curtido. El proceso de descromación está basado en la oxidación del cromo(III) a cromo(VI) usando peróxido de hidrógeno en medio básico. Además, la misma reacción de oxidación se ha utilizado para la recuperación de las sales de cromo(III) de los efluentes cromados. Por otra parte, las reacciones termoquímicas (procesos de adsorción química y las reacciones químicas sólido-gas) abren una nueva posibilidad para el almacenamiento térmico de energía solar por periodos largos de tiempo en zonas residenciales. Este trabajo aporta una revisión sobre la investigación experimental de sistemas de almacenamiento térmico con materiales termoquímicos (TCM). Además, la memoria presenta el trabajo realizado en la caracterización experimental de MgSO4•7H2O, Al2(SO4)3•18H2O, CaCl2•2H2O and MgCl2•6H2O para la determinación de su aplicación como TCM en un sistema estacional de almacenamiento térmico de energía solar. Los resultados experimentales indicaron que los cloruros pueden liberar calor al sistema de calefacción residencial a temperaturas más altas que los sulfatos.
The current thesis is a contribution to create energy and resource efficient economy by means of chemical reactions. In particular, the thesis presents, on one hand, a quick and effective procedure for recovery of chromium (III) salts and isolation of high added value collagenic biopolymners from chromium(III) tanned solid wastes. The dechroming process is based on the oxidation of chromium(III) to chromium using hydrogen peroxide in alkaline medium. Additionally, the same oxidation reaction was used for recovery of chromium(III) salts from tannery effluents. On the other hand, thermochemical reactions (chemical adsorption processes and solid-gas chemicals reactions) open a new way for long-term solar heat storage in residential areas. The present work gives a review of the experimental research on thermal energy storage systems with thermochemical materials (TCM). Moreover, this work describes the experimental characterisation of MgSO4•7H2O, Al2(SO4)3•18H2O, CaCl2•2H2O and MgCl2•6H2O to determine is suitability for application in a seasonal solar heat storage system. Experimental results showed that the chlorides can deliver heat to the residential heating system at a higher temperature than the sulphates.
Bücher zum Thema "Sustainable biopolymers"
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Zehra, Saman, Mohammad Mobin und Chandrabhan Verma. Biopolymers in Sustainable Corrosion Inhibition. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003400059.
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2
Plackett, David, Hrsg. Biopolymers - New Materials for Sustainable Films and Coatings. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9781119994312.
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3
Plackett, D. V. Biopolymers: New materials for sustainable films and coatings. Chichester, West Sussex, UK : Hoboken, NJ: Wiley, 2011.
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4
1965-, Jiménez Alfonso, und Zaikov Gennadiĭ Efremovich, Hrsg. Recent advances in research on biodegradable polymers and sustainable composites. New York: Nova Science Publishers, 2009.
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5
Biopolymers in Sustainable Corrosion Inhibition. CRC Press LLC, 2024.
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Biopolymers in Sustainable Corrosion Inhibition. Taylor & Francis Group, 2024.
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Warangkana, Sudarshan Singh;. Biopolymers Towards Green and Sustainable Development. Bentham Science Publishers, 2022.
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Chunglok, Warangkana. Biopolymers Towards Green and Sustainable Development. Bentham Science Publishers, 2022.
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Warangkana, Sudarshan Singh;. Biopolymers Towards Green and Sustainable Development. Bentham Science Publishers, 2022.
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10
Plackett, David. Biopolymers: New Materials for Sustainable Films and Coatings. Wiley & Sons, Incorporated, John, 2011.
Den vollen Inhalt der Quelle findenBuchteile zum Thema "Sustainable biopolymers"
1
Ismael, Mustafa K. „Sustainable Biopolymers“. In Handbook of Biodegradable Materials, 1–31. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-83783-9_15-2.
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Ismael, Mustafa K. „Sustainable Biopolymers“. In Handbook of Biodegradable Materials, 1–31. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-83783-9_15-1.
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Ismael, Mustafa K. „Sustainable Biopolymers“. In Handbook of Biodegradable Materials, 319–49. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-09710-2_15.
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Abdul Khalil, H. P. S., M. R. Nurul Fazita und N. Mohd Nurazzi. „Seaweed-Based Biopolymers for Sustainable Applications“. In Biopolymers and Biopolymer Blends, 284–307. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003416043-8.
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Kumawat, Tarun Kumar, Varsha Kumawat, Swati Sharma, Vishnu Sharma, Anjali Pandit, Nirat Kandwani und Manish Biyani. „Sustainable Green Methods for the Extraction of Biopolymers“. In Biopolymers, 73–110. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98392-5_5.
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Mehta, Jimmy, Prateek Mittal und Pallav Gupta. „Biopolymers and Sustainable Biopolymers Based Composites“. In Fabrication Techniques and Machining Methods of Advanced Composite Materials, 101–18. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003427735-6.
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Masroor, Sheerin. „Overview of Biopolymers“. In Biopolymers in Sustainable Corrosion Inhibition, 1–13. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003400059-1.
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Bhasney, Siddharth Mohan, Shubhranshu Ranjan Das, Arbind Prasad, Bidyanand Mahto und Sivasakthivel Thangavel. „Recycling of biopolymers“. In Biodegradable Waste Processing for Sustainable Developments, 272–98. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003502012-13.
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Ahmed, Iqbal, Hira Zulfiqar, Ijaz Hussain, Muhammad Waqas, Muhammad Furqan Farooq und Hunain Zulfiqar. „Green Biopolymers in Sustainable Packaging“. In Green Biopolymers for Packaging Applications, 161–92. Boca Raton: CRC Press, 2024. https://doi.org/10.1201/9781003455356-7.
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Athwal, Shinar, Swati Sharma, Shreya Gupta, Ashok Kumar Nadda, Arun Gupta und Mohamed Saad Bala Husain. „Sustainable Biodegradation and Extraction of Keratin with Its Applications“. In Handbook of Biopolymers, 1–35. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6603-2_27-1.
Der volle Inhalt der QuelleKonferenzberichte zum Thema "Sustainable biopolymers"
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Sandoval, Neyder A., Edwin A. Murillo und Sophia A. Tsipas. „Evaluation Of Biopolymers To Produce Metal Or Metal-Ceramic Feedstocks For Eco-Sustainable Composite Extrusion Modelling“. In Euro Powder Metallurgy 2024 Congress & Exhibition. EPMA, 2024. http://dx.doi.org/10.59499/ep246282804.
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Sinter-based additive manufacturing of metallic materials offers advantages in terms of design and efficiency but poses environmental concerns due to the use of chemicals and the generation of pollutant gases during the elimination of binders which are harmful to the environment. To improve this problem, the study of biopolymeric binders derived from renewable sources is proposed. This work explores composite extrusion modelling of metallic or metal-ceramic alloys using biopolymers to produce environmentally friendly feedstocks. Comprehensive evaluation of biopolymer blends based on poly lactic acid and polyvinyl alcohol were carried out for their use as binders. A study of critical solidity loads, microstructural, rheological characterisation, densification, and homogenisation, studies were performed.
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Nicolae, Madalina, Claire Lefez, Anne Roudaut, Samuel Huron, Jürgen Steimle und Marc Teyssier. „SoftBioMorph: Fabricating Sustainable Shape-changing Interfaces using Soft Biopolymers“. In DIS '24: Designing Interactive Systems Conference. New York, NY, USA: ACM, 2024. http://dx.doi.org/10.1145/3643834.3661610.
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Ramachandran, Asha, Navdeep Kaur Dhami und Abhijit Mukherjee. „Sustainable utilization of biopolymers and biocement in aggregation of granular materials“. In Fifth International Conference on Sustainable Construction Materials and Technologies. Coventry University and The University of Wisconsin Milwaukee Centre for By-products Utilization, 2019. http://dx.doi.org/10.18552/2019/idscmt5064.
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Ronzano, Anna, Roberta Stefanini, Giulia Borghesi und Giuseppe Vignali. „Agricultural waste as a source of innovative and compostable composite biopolymers for food packaging: a scientific review“. In the 7th International Food Operations and Processing Simulation Workshop. CAL-TEK srl, 2021. http://dx.doi.org/10.46354/i3m.2021.foodops.005.
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"The recovery of agriculture waste is one of the challenges of 2030 Agenda. Food and Agriculture Organization states that 30 % of the world’s agricultural land is used to produce food that is later lost or wasted, and the global carbon footprint corresponds to 7% of total greenhouse gases emissions. Alternatively, natural fibers contained in food and agricultural waste could be a valuable feedstock to reinforce composite biopolymers contributing to increase mechanical properties. In addition, the use of biopolymers matrix could contribute significantly to reduce the environmental footprint of the biobased compounds. Based on these premises, a regional project in Emilia-Romagna, aims to enhance agricultural waste to produce food packaging materials which in turn would contribute to the reduction of green raw materials used. This article reviews the state of art of composite biopolymers added with fillers extracted by food and agricultural waste, analyzing the literature published on scientific databases such as Scopus. The characteristics, advantages and drawbacks of each innovative sustainable material will be studied, trying to compare their various properties. The results of the work could guide companies in the choice of eco-sustainable packaging and lay the foundations for the development of the mentioned regional project."
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Trambitski, Yahor, Olga Kizinievič und Viktor Kizinievič. „Designing of Sustainable Building Material Made of Non-Fired Clay with Various Biopolymers“. In International Conference EcoBalt. Basel Switzerland: MDPI, 2023. http://dx.doi.org/10.3390/proceedings2023092056.
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MASROUR, Ilham. „Naturally Strengthening Rammed Earth: The Promising Potential of Biopolymers“. In Mediterranean Architectural Heritage. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903117-25.
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Abstract. Sustainable construction has become a global imperative due to the growing awareness of the harmful environmental impacts of the construction industry. The use of cement and lime in traditional methods of stabilizing earth constructions is a significant problem due to their high carbon footprint. This article examines an ecological alternative to stabilizing earth structures with biopolymers. These Bio-based materials can be used to reduce the environmental impact of the construction industry while also ensuring the structure's stability and durability. The purpose of this article is to examine the mechanical properties of biopolymers in the context of stabilizing earth construction. The objective is to guide the decision on which stabilization method to use for earth construction based on the available resources.
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MASROUR, Ilham. „Restoration of the Kasbah of Boulaouane: An innovative approach using eco-friendly geopolymer and biopolymer composite materials“. In Vernacular Architecture: Support for Territorial Development, 180–87. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903391-21.
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Abstract. The Kasbah of Boulaouane, a magnificent 18th-century fortress near El Jadida, Morocco, faces a critical challenge. Built by Sultan Moulay Ismaïl, this historical monument is suffering from cracks and instability due to weathering and neglect. The traditional rammed earth walls, once a symbol of resilience, are now threatened. This study proposes a groundbreaking and ecological solution for the Kasbah's restoration: a composite material combining geopolymer and biopolymer. Geopolymers, formed from eco-friendly alkaline solutions and pozzolans, offer exceptional strength, while biopolymers, derived from fermented wheat straw, provide additional reinforcement. Our research demonstrates that this innovative combination significantly increases the flexural and compressive strength of rammed earth. By incorporating these modern, sustainable materials with time-tested techniques, we can not only restore the Kasbah of Boulaouane to its former glory but also ensure its longevity for future generations. This method has the potential to revolutionize the preservation of rammed earth structures worldwide, safeguarding our cultural heritage for years to come.
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Rackov, Sanja, Milan Vraneš, Tamara Erceg und Branka Pilić. „Development of Nanomaterials for Sustainable Food Packaging Applications“. In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.148r.
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The use of biodegradable polymers from renewable resources in polymer manufacturing, food packaging and for medical application is becoming a favorable option over petroleum-based plastics. Among all biopolymers, biopolyesters poly(lactic acid) (PLA) and polyhidroxyalkanoates (PHAs) are considered as the most commercially promising bioplastics. PLA is a biopolyester produced by polymerization of D-, L- lactic acids originating through fermentation of simple sugars from agricultural sources (corn, potato, sugar cane, sugar beet, etc.). PHA is a generic designation for biopolyesters produced by controlled microbial fermentation in the presence of an abundant source of sugars or lipids. The focus of this study was to prepare fully biodegradable flexible nanomaterials using PLA and poly(hydroxybutyrate) (PHB) polymer blend solution by means of electrospinning technique. Since PHB possesses low resistance to thermal degradation with melting temperatures close to degradation and narrowing the processing window, the electrospinning technique reduces energy consumption and avoids thermal degradation during processing. A complete morphological, structural and thermal characterization of the developed materials was conducted at the same time.
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Pesce, Cecilia, Giovanni Pesce, Marco Molinari und Alan Richardson. „Customising Microstructural and Mineralogical Characteristics of Hydrated Lime Using Biopolymers“. In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.353.
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The study of lime-based systems is vital to the design of new sustainable building materials. Air lime (calcium hydroxide, Ca (OH)2) is a binder that has attracted considerable attention for its ability to capture CO2 from the atmosphere, its low-cost and low-energy production process. Furthermore, Ca (OH)2 is an important phase of hydrated Portland cements, and lime-based mortars have shown high elasticity and the ability of self-healing. The performance of lime-based building materials can be enhanced by the addition of organic compounds that can modify the mineralogy and microstructure of Ca (OH)2. In this study, the effects of four biopolymers including starch, inulin, pectin, and calcium lignosulfonate, on the microstructure and mineralogy of lime have been investigated. Hydrated lime was produced by slaking quicklime in water. Two sets of hydrated lime batches were produced for each polymer: (i) the polymer was previously dissolved in water and subsequently mixed with lime, and (ii) the polymer was added as a dry powder to the already hydrated lime at the end of the slaking process. Characterisation of the batches was performed using scanning electron microscopy, X-ray diffraction and laser diffraction. Results indicate that biopolymers affect the nucleation and growth of Ca (OH)2 crystals. This influences the microstructure and crystal aggregation of hydrated lime in colloidal suspension, which will have important implications on the use of biopolymers in Portland cement applications and in the use of lime as a binder for mortars.
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Houston, Kirsty Ann, Niall Fleming, Julya Jennifer Bonkat, Havard Kaarigstad, Jonathan Barclay, Russell Watson und Patrick Viste. „Innovative Water Based Mud Design to Improve Formation Damage Results on Mariner Field“. In SPE International Conference and Exhibition on Formation Damage Control. SPE, 2022. http://dx.doi.org/10.2118/208844-ms.
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Abstract The Mariner Field consists of two shallow heavy oil reservoir sections: the deeper Maureen Formation and the shallower Heimdal Reservoir. Produced water is re-injected through stand-alone screens providing pressure maintenance for the aquifer support and producer well life longevity. The challenge is to design a drill-in fluid for the injectors to allow matrix injection across the sand face. This improves the longevity of the lower completion screens by reducing hot spot completion damage created by the injection fluid (Yildiz, 2004). It also improves the pressure support for the producing wells. Equinor is committed to using sustainable, environmentally sound drilling fluid options. Therefore, the preference was to utilize a water-based drilling fluid with the application of a breaker after the lower completion was in place. A significant formation damage study was performed using various designs of water-based fluids. Each formulation utilized a biopolymer to provide viscosity and rheological support. The sands were unconsolidated and sand packs had to be created to mimic the reservoir characteristics of the Maureen reservoir. This potentially impacted the formation damage interpretation. From the formation damage study, biopolymer was highlighted as a limiting damage mechanism. This prompted both Equinor and Schlumberger to look at alternative ways to provide rheological support without using biopolymers. A mono-valent biopolymer free reservoir drill-in fluid was designed specifically for this challenging high Darcy reservoir to mitigate the formation damage seen from coreflooding. This paper will detail the design, testing, diagnostic analysis of the formation damage mechanism and the new biopolymer free fluid. Together they showed a step change improvement in the formation damage testing. In addition, the paper will also detail the deployment of the new fluid on Mariner. Furthermore, it will describe how the laboratory design translated into large scale plant mixing with deployment at the rig site.
Berichte der Organisationen zum Thema "Sustainable biopolymers"
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Possidónio, Catarina, Ana Rita Farias, Samuel Domingos, Bernardo Cruz, Sílvia Luís und Ana Loureiro. Exploring supply-side barriers for commercialization of new biopolymer production technologies: A systematic review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, Mai 2023. http://dx.doi.org/10.37766/inplasy2023.5.0076.
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Review question / Objective: What are the multi-level supply-side barriers to the commercialization of new biopolymer production technologies? Condition being studied: Biopolymers are sustainable and environmentally friendly alternatives to traditional petroleum-based polymers, and their use is becoming increasingly important for reducing the negative impact of plastic waste on the environment. Despite the potential benefits of biopolymers, their commercialization might face several supply-side barriers. This systematic review aims the identification and characterization of these barriers. The focus is on understanding the challenges involved in the commercialization of new biopolymer production technologies, which may include technological, economic, regulatory, and social factors that can affect the adoption and use of biopolymers in various industries. The question studied in this systematic review is relevant to a broad range of stakeholders, including researchers, policymakers, and industry professionals involved in the development, production, and commercialization of new biopolymer technologies. By providing a comprehensive synthesis of the existing literature on the multi-level supply-side barriers that can hinder the commercialization of new biopolymer production technologies, this systematic review aims to inform future research, policy, and practice to facilitate the successful implementation of these technologies.