Дисертації з теми "Polypropylene Composites Reinforced"
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Biyana, Nobuhle Yvonne. "Studies on flax/polypropylene-reinforced composites for automotive applications." Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/d1021150.
Повний текст джерелаLee, Peter. "Blow molding behaviour of wood fibre-reinforced polypropylene composites." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0003/MQ45434.pdf.
Повний текст джерелаKim, Soeyeh. "Investigation of the characteristics of kenaf fibre reinforced polypropylene composites." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/11579.
Повний текст джерелаIncludes bibliographical references (leaves 135-140).
This research work focus on the characterisation of the mechanical and thermal properties of kenaf fibre reinforced polypropylene composites. The composites were fabricated by extrusion followed by injection and compression moulding. The effects of fibre content, coupling agent content (MAPP), different types of moulding processes and addition of filler materials (kenaf core) were observed through mechanical, thermal and microscopic testing.
Tam, Mei San. "Study of sisal fiber-reinforced polypropylene, polyethylene and polypropylene/polyethylene blend composites prepared by compression molding." access abstract and table of contents access full-text, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21175123a.pdf.
Повний текст джерелаAt head of title: City University of Hong Kong, Department of Physics and Materials Science, Master of Science in materials engineering & nanotechnology dissertation. Title from title screen (viewed on Sept. 4, 2006) Includes bibliographical references.
Ismail, Yob Saed Bin. "Structure/property relationships associated with woven glass fibres reinforced polypropylene composites." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/11902.
Повний текст джерелаWang, Shi-Wei. "Controlling the structure and properties of toughened and reinforced isotactic polypropylene." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0231/document.
Повний текст джерелаAs a commodity polymer, the applications of isotactic polypropylene (PP) are limited by its low impact strength. Based on the structure-property relationship, its impact strength could be improved by controlling its structure. In this study, different kinds of nucleating agents were used to promote the formation of beta crystals of PP as well as mixtures of two PPs of different molar masses. The mechanical properties, fracture behaviour, and crystalline morphology were investigated. The effects of the type and content of the peroxide and nucleating agent on the crystalline structure and mechanical properties of the PP were also explored. A multi-walled carbon nanotude (MWCNT) supported nucleating agent was introduced to modify the crystalline structure of PP and the impact strength of the resulting PP was 7 times that of the pure PP and more than 3 times that of beta nucleated PP. The large increase in the impact strength was attributed to the formation of beta transcrystalline morphology which was promoted by the MWCT supported nucleating agent
Magrini, Michael A. "Fiber reinforced thermoplastics for ballistic impact." Birmingham, Ala. : University of Alabama at Birmingham, 2010. https://www.mhsl.uab.edu/dt/2010m/magrini.pdf.
Повний текст джерелаSingh, Peter. "Molding behaviour and microstructure of injection molded short glass fiber reinforced polypropylene composites." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74240.
Повний текст джерелаThis work attempts to examine quantitatively various aspects of microstructure and the effect of processing conditions in SFRTP. The matrix phase properties, such as crystallinity, morphology and molecular orientation distribution, as well as the fiber phase microstructure such as concentration, length and orientation distributions have been analyzed quantitatively, and explained. Experimental techniques, including optical and electron microscopy, differential scanning calorimetry, Fourier transform infrared spectroscopy, thermo-gravimetric analysis, etc. have been used. The results indicate complex changes in microstructure from skin to core in the injection molded samples. Both matrix and fiber phase microstructures are affected by the basic thermal and flow processes that occur during the injection molding process. A first order model has been developed to predict fiber orientation distributions, which agree well with the experimental results.
Amna, Ramzy Verfasser], and Gerhard [Akademischer Betreuer] [Ziegmann. "Recycling aspects of natural fiber reinforced polypropylene composites / Ramzy Amna ; Betreuer: Gerhard Ziegmann." Clausthal-Zellerfeld : Technische Universität Clausthal, 2018. http://d-nb.info/1231364289/34.
Повний текст джерелаVaddi, Satya. "Flammability evaluation of glass fiber reinforced polypropylene and polyethylene with montmorillonite nanoclay additives." Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2009r/vaddi.pdf.
Повний текст джерелаTitle from PDF title page (viewed Feb. 1, 2010). Additional advisors: Derrick R. Dean, Gregg M. Janowski, Selvum (Brian) Pillay (ad hoc). Includes bibliographical references (p. 76-82).
Beg, Mohammad Dalour Hossen. "The Improvement of Interfacial Bonding, Weathering and Recycling of Wood Fibre Reinforced Polypropylene Composites." The University of Waikato, 2007. http://hdl.handle.net/10289/2553.
Повний текст джерелаKhoathane, MC, OC Vorster, and ER Sadiku. "Hemp Fiber-Reinforced 1-Pentene/Polypropylene Copolymer: The Effect of Fiber Loading on the Mechanical and Thermal Characteristics of the Composites." SAGE, 2008. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000586.
Повний текст джерелаChaishome, Jedsada. "The effect of processing parameters on the mechanical properties of vacuum formed flax fibre reinforced polypropylene composites." Thesis, University of Nottingham, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.594739.
Повний текст джерелаCollier, Monty C. "Reclamation and Reprocessing of Thermotropic Liquid Crystalline Polymer from Composites of Polypropylene Reinforced with Liquid Crystalline Polymer." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36859.
Повний текст джерелаMaster of Science
Kalyankar, Rahul R. "Natural fiber reinforced structural insulated panels for panelized construction." Birmingham, Ala. : University of Alabama at Birmingham, 2009. https://www.mhsl.uab.edu/dt/2010r/kalyankar.pdf.
Повний текст джерелаAl-Kahtani, Salah Msfir. "The effects of hemp fibres on the mechanical and physical properties of E-glass fibres reinforced polypropylene (Twintex) composites." Thesis, University of Portsmouth, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.530113.
Повний текст джерелаElsabbagh, Ahmed [Verfasser], and Gerhard [Akademischer Betreuer] Ziegmann. "Processing and optimising the mechanical and physical properties of natural fibre reinforced polypropylene composites / Ahmed Elsabbagh ; Betreuer: Gerhard Ziegmann." Clausthal-Zellerfeld : Technische Universität Clausthal, 2017. http://d-nb.info/1231364947/34.
Повний текст джерелаKrishnaiah, Prakash. "Development of polylactide and polypropylene composites reinforced with sisal fibres and halloysite nanotubes for automotive and structural engineering applications." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/43498/.
Повний текст джерелаHowever, surface treatments and/or modification were playing an important role in order to tune the required mechanical and thermal properties of the polymer composites. This study also proved that in comparison to the conventional polymer matrix materials such as PP, PLA is a strong competitor with respect to its good mechanical properties and improved thermal stability apart from the fact that PLA is one of the best known biodegradable and biocompatible polymer matrices in the current market to use not only in medical application, but also in various commercial applications such as packaging, automotive and home appliances.
De, Souza Rios Alexandre. "Mechanical behavior of recycled polypropylene reinforced by coconut fibers using X-ray tomography and digital image correlation." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLN023/document.
Повний текст джерелаThe objective of this work is to characterize the mechanical behavior of composites made with recycled polymeric matrices reinforced with natural fibers. The materials studied in this thesis are the polypropylene matrix and the coconut fibers for reinforcement. The morphological and mechanical characterization of these materials is undertaken with the use of scanning electron microscopy, X-ray tomography, the digital image correlation and infrared thermography.In the first part, we studied in detail the coconut fibers in three different states: in its natural state and after chemical treatment followed or not drying. The fibers were observed in tomography and their essential characteristics defined. Furthermore in situ mechanical testing in a scanning electron microscope were conducted to obtain their mechanical properties. It has almost been carried out the mechanical characterization fabrics of the behavior for use in a composite. In a second part, the mechanical behavior of polypropylene (virgin or recycled state) was analyzed by tensile testing at imposed displacement and various charging speeds. These tests were instrumented for measurement of displacement fields and temperatures, the first to measure the deformation conditions, the progression of the damage and observe the failure modes of the material. The effect of recycling is particularly pointed out and degradation of mechanical properties. Complete specifications (elasticity, peak and shelf and damage) and the effect of speed on them are exhibited for both states. In the last part of the work, it was interested in the behavior of the composite matrix considering the blank state or in the recycled state. The characteristics obtained are discussed emphasizing the influence of the method of production used and the contribution of coconut fibers
Beckermann, Gareth. "Performance of Hemp-Fibre Reinforced Polypropylene Composite Materials." The University of Waikato, 2007. http://hdl.handle.net/10289/2543.
Повний текст джерелаLindhagen, Johan. "Notch sensitivity and failure of glass mat reinforced polypropylene." Licentiate thesis, Luleå tekniska universitet, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18077.
Повний текст джерелаBriskham, Paul Graham. "Strong and durable fusion bonding of glass reinforced polypropylene to pretreated aluminium." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342549.
Повний текст джерелаSultangaliyeva, Fariza. "Formulation of fluid fire-resistant fiber-reinforced cementitious composite : Application to radioactive waste disposal." Thesis, Pau, 2020. http://www.theses.fr/2020PAUU3041.
Повний текст джерелаThe aim of the thesis is to design a self-compacting concrete with polypropylene fibers resistant to fire for a use in storage containers of medium activity long-lived waste. The challenge of the work is presented by the use of polypropylene fibers that enhance fire resistance but drastically diminish workability of concrete even when added at small volume fractions. Tests on laboratory scale are conducted with a purpose of evaluating rheological behavior and high temperature behavior of cementitious materials containing polypropylene fibers.In the first part, a study of rheological behavior of cement-based materials containing polypropylene fibers was done. The aim of this study is to investigate the influence of polypropylene fibers on the yield stress of cement pastes and mortars. A model is proposed to be able to evaluate the quantity of paste necessary to compensate the addition of polypropylene fibres according the fluidity of fresh concrete.Then an experimental and numerical investigation of behavior of cementitious materials with polypropylene fibers at high temperature was done so as to optimize the choice of polypropylene fibers for cementitious material to improve its thermal stability. Three different cementitious materials with three different granular skeleton containing various polypropylene fiber geometries and dosages were tested (residual radial permeability test and fire test) in order to select an optimal fiber geometry and dosage. Then thermomechanical computations was developped at maco and meso scale. Then, a choice of diameter, length and dosage of fibres is proposed according to the maximum size of gravels.Finally, a method of concrete formulation with polypropylene fibers optimized from perspectives of rheology and resistance to fire is presented. In this method, fresh and hardened state properties are verified to ensure an accordance with performance criteria specified by the project. At the end, designed mixes were tested in fire tests conducted on uniaxially compressed prisms and, based on outcomes, final mixes are selected for further fire tests on higher scale concrete
Modh, Haresh A. "Chemical treatment and adhesion in internally reinforced rayon fibers." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182867766.
Повний текст джерелаHan, Hongchang. "Study of agro-composite hemp/polypropylene : treatment of fibers, morphological and mechanical characterization." Thesis, Troyes, 2015. http://www.theses.fr/2015TROY0002/document.
Повний текст джерелаUsing agro fiber as reinforcement of polymer com-posites attracts numerous investigations due to the good mechanical properties and environmental benefits. Prior to blend agro fiber with polymer, chemical treatment can be employed to treat agro fiber for the purpose of reducing the hydrophilicity of fiber and improving the interfacial adhesion fi-ber/polymer matrix. In this thesis, water and alkali are utilized to treat hemp fiber firstly and then three silane agent as 3-(Trimethoxysilyl)propyl methacry-late (MPS), N-[3-(Trimethoxysilyl)propyl]aniline (PAPS) and (3-Aminopropyl)-triethoxysilane (APS) are employed to modify the hemp fiber surface. These treated or modified fibers are blended respectively with polypropylene (PP) to fabricate the hemp fiber/PP composites. The effects of these different treatments on the structure, components and hydro-philicity of fiber, and the mechanical properties of the reinforced PP composites are studied. Moreover, the accelerated ageing experiments including humidity, temperature and ultraviolet of the reinforced PP composites are conducted. The results showed that the fiber treatment of water and alkali has a considerable effect on fiber structure, mechanical properties and durability of the reinforced compo-sites. The silane agent modification of fiber has less influence on the fiber structure but its functional group has great influence on the mechanical proper-ties and ageing resistance of the reinforced compo-sites
Imaddahen, Amine. "Étude expérimentale multi-échelle et modélisation hybride prédictive du comportement, de l'endommagement et de la durée de vie en fatigue d’un matériau composite polypropylène / fibres de verre." Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAE063.
Повний текст джерелаThe main objective of this work, is to provide a numerical tool, capable of predicting the damage and fatigue life of thermoplastic matrix composites materials and structures. To do this, a multi-scale experimental study of the PPGF40 material (polypropylene loaded with 40% by mass of glass fiber) is carried out. A qualitative, but also a quantitative analysis of the various damage mechanisms occurring during mechanical loading was carried out through in-situ three-points SEM bending tests, interrupted fatigue tests and observations of fracture faces in monotonic and cyclic loading. In the light of these tests, we concluded that the decohesion of the fiber-matrix interface, and the propagation of cracks through the interfaces, appears to be, the predominant damage phenomenon leading to the fracture of the material and that, regardless of the orientation of the fibers and the loading mode. The proposed hybrid approach is based on a micromechanical / phenomenological model taking into account the damage at the fiber / matrix interface and the plasticity of the matrix. To do this, a local statistical criterion of damage at the fiber-matrix interface is introduced into a Mori and Tanaka model, and the linearization of the plastic behavior of the matrix is done step by step, using the mean field approach with a secant formulation. The micromechanical model used then, makes it possible to predict the behavior of the material under monotonic loading, and in particular the first stiffness loss during the fatigue. Analysis of the experimental results shows that the latter is directly related to the fatigue life of the material. Thus, a predictive methodology of the fatigue life is proposed and validated for various microstructural configurations. A fatigue failure criterion is proposed according to the number of cycles
Počekajlo, Václav. "Trvanlivost sanačních hmot pro železobetonové konstrukce s vyšší odolnosti proti požáru." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227675.
Повний текст джерелаLIN, YU-CHEN, and 林雨辰. "Preparation and analysis of flax fiber-reinforced polypropylene composites." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/41987624408938804372.
Повний текст джерела明志科技大學
化學工程系碩士班
104
This study adopts the compounding method using a Banbury mixer to blend polypropylene (PP) and flax fibers to obtain the natural fiber-reinforced PP composites. Test samples for mechanical testing were prepared by injection molding. The polar flax fibers have low compatibility with non-polar polymer matrices such as PP. By this token, treatment of flax fibers is beneficial in order to promote interfacial adhesion. The surface modification of flax fibers was carried out using four different functional groups of silane coupling agents and the modified flax fibers were characterized by Fourier transform infrared spectroscopy. The morphology of the modified fibers was examined by scanning electron microscope. The result shows that the hydrolysis step of BRB276 and BRB258 is difficult to proceed unless adding acetic acid as catalyst. BRB919 is easy to proceed hydrolysis reaction without adding catalyst. The thermal stability of the composites was examined by thermogravimetric analysis. The thermal stability of the composites with BRB919 treated flax fibers is better than that of the others. This may be due to the flax fibers modified by BRB919 could improve the interfacial force between PP and flax fibers. According to the tensile test, adding flax fibers in PP could increase the tensile strength and Young’s modulus. However, the elongation of the composites was decreased compared to neat PP. The impact strength of the composites with silane treated fibers is better than those without silane treated fiber.
SU, BO-YU, and 蘇柏宇. "A Study of Woven Jute Fiber Cloth Reinforced Polypropylene Composites." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/tq3taw.
Повний текст джерела朝陽科技大學
應用化學系
105
In this study, woven jute fiber cloth (Jf) was used to reinforce polypropylene (PP), and a commercially available flame retardant was added to increase the application PP. Maleic anhydride grafted polypropylene (MAPP) was added as a compatibilizer. Moreover, Jf was chemically treated and modified by 3-Aminopropyltriethoxysilane to enhance the properties of the composites. The results showed that the absorption peaks of C-Br and Sb2O3 were found in the FTIR spectrum of flame retardant. And the Jf is composed of jute yarn, PE fiber and PP/PE blending fiber. TGA analysis revealed that the decomposition temperatures (Td5 and Td20) of the composites were increased by improving the compatibility of the composites, and char yield was also increased. The results of tensile and impact tests showed that PP/MA/BJf exhibited the best tensile and impact strengths. The results of UL-94 test showed that the flame retardancy of the flame retardant containing composite materials can achieve the highest level (V-0). SEM analysis can be observed that the compatibility between Jf and PP was improved by the chemical treatment of Jf. Based on the above results, Jf reinforced PP composite materials can reinforce PP with low cost, and increase the applications of PP.
Liu, Ya-Shin, and 劉雅馨. "Mechanical Properties of Braided Jute/Polypropylene Fabrics Reinforced Epoxy Composites." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/18557376547703416766.
Повний текст джерела萬能科技大學
材料科技研究所
99
The main objective of this thesis was to study the mechanical characteristics of Jute/Polypropylene braided fabric reinforced epoxy composites. A tubular braiding machine was used to braid the jute yarns and polypropylene (PP) yarns to get hybrid jute/PP tapes. The tapes were, then, used as weft and warp yarns, which supplied to a weaving loom, to fabricate reinforced fabrics. The fabrics are plain woven construction. Three reinforced fabrics (braided jute tape plain fabric, braided polypropylene tape plain fabric and co-braid jute/polypropylene tape plain fabric) had been developed in this experiment. After finished the weaving procedure, the produced fabrics impregnated with epoxy resin to get the braided tape fabrics reinforced composites. The co-braid jute/polypropylene tape plain fabrics were, also, heated and pressed onto a hot-press machine to fabricate thermoplastic composites. A material test system was used to study the tensile, compressive and flexural properties of the composites. In addition, the iMPact properties were evaluated by an Izod iMPacting machine. The failure phenomenon of the composites was, also, discussed, in the current experiment. Experimental results revealed that the co-braid structure of Jute/PP fabric improved the compressive resistance of the composites. Furthermore, adding PP braided reinforced fabrics increases composites toughness and yields better energy absorption in coMParison with pure epoxy sample.
Wu, Pei-Yu, and 吳珮瑜. "A Study of Jute Fiber/ Biomass waste Reinforced Polypropylene (PP) Composites." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/49943027714600776853.
Повний текст джерела朝陽科技大學
應用化學系
103
In this study, the matrix and reinforcements were melting blended to obtain the composites. The matrix was polypropylene (PP), and the reinforcements were jute fiber, kenaf powder or rice husk powder. The addition amount of reinforcements were 20 to 40 wt%. In addition, the jute fiber was modified by silane coupling agent (3-Aminopropyltriethoxysilane), and maleic anhydride grafted polypropylene (MAPP) was added as compatibilizer to improve the compatibility between reinforcements and PP, then enhanced the mechanical and thermal properties of the composites. The results reveal that the composites containing 30wt% of jute fiber/kenaf powder possessed the best properties. Moreover, the composites containing 30wt% of jute fiber/rice husk powder were prepared and compared with the jute fiber/kenaf powder ones. The results reveal that the higher heat distortion temperature (about 150.90 ~ 153.05 ℃) were obtained when the ratio of jute fiber and kenaf powder is 1: 3. However, the heat distortion temperatures of jute fiber/rice husk powder composites were increased with increasing content of jute fiber. The tensile and impact strengths of the composites could be increased about 46.63% and 61.86% as compared with those of pure PP. The results of thermal analysis reveal that the heat resistance of the PP was improved by the addition of the reinforcements. Microscopic analysis indicate that the dispersion of jute fiber in the matrix was well when the composites containing 30wt% of reinforcements. As well as enhancing the mechanical properties and thermal stability, the reinforced composites are more environmentally friendly than the artificial additive-reinforced ones. The waste from the kenaf and rice husk is effectively reduced and re-used, and the cost of materials can be reduced.
"Effect of Fiber Morphology on Tensile Properties of Polypropylene Cement Composites." Master's thesis, 2017. http://hdl.handle.net/2286/R.I.44218.
Повний текст джерелаDissertation/Thesis
Masters Thesis Civil Engineering 2017
Govinden, Sumilan. "The effect of montmorillonite clay on the mechanical properties of kenaf reinforced polypropylene composite." Thesis, 2017. https://hdl.handle.net/10539/24131.
Повний текст джерелаAn investigation was carried out to determine the effect of the addition of clay on the mechanical properties of a Natural Fibre Composite consisting of a polypropylene matrix with kenaf fibre reinforcement. The kenaf fibres were treated using various chemical treatments to improve the strength of the composites manufactured. Four treatments using different 3-mercaptopropyltrimethoxy silane (MPS) concentrations were investigated to determine which treatment resulted in the best mechanical properties. [Abbreviated Abstract. Open document to view full version]
MT 2018
Khoathane, Moshibudi Caroline. "Natural fibre reinforced polyolefins composites for structural applications." Thesis, 2012. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000602.
Повний текст джерелаAims to develop a thermoplastic matrix-based composite with a view to identifying the most suitable combinations of locally available natural fibres and matrices, which meet some basic requirements (e.g., fire and moisture resistance) for the structural and non-structural materials utilised in the building and construction industries.This general goal is divided into three distinct aims: 1. Examine the chemical surface modification of natural fibres (flax, hemp, pineapple and sisal) using water glass (WG). The study investigates the effect of WG treatment on the mechanical and thermooxidative properties of natural fibres. 2. To produce untreated and WG-treated short sisal/polypropylene (with or without maleic anhydride-grafted-polypropylene) compounds using the injection moulding process. The study also investigates the failure behaviour of the composites produced by the tensile-acoustic emission technique as well as the thermal and water absorption characteristics thereof. 3. To produce untreated and WG-treated nonwoven sisal/polypropylene (with or without maleated polypropylene) composites by using the compression moulding process. The study also investigated the fire resistance characteristics of composite materials.
Asumani, Oscar. "Characterization of the mechanical and moisture absorption properties of kenaf reinforced polypropylene composites." Thesis, 2014. http://hdl.handle.net/10539/15415.
Повний текст джерелаWei, Chen-Po, and 陳伯瑋. "A study of polypropylene composites reinforced by the fiber recycling from disposable chopsticks." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/08792840921155273129.
Повний текст джерела朝陽科技大學
應用化學系碩士班
97
This study adopts the compounding method using a Banbury Mixer to blend polypropylene (PP), methylacetylene-propadiene (MaPP) and natural fibers (bamboo) to obtain the natural fiber-reinforced green PP composites. First of all, the bamboo chopsticks were treated with alkali to remove the surface pectin, hemicellulose and other impurities, and then treated by coupling agent to change its nature chemically. Subsequently, PP was blended with different proportions of these chemically-treated fibers and non-treated fibers, to form the plant fiber-reinforced composites. The materials were then investigated for their morphology (dispersibility and compatibility), mechanical (tensile strength, bending endurance and impact strength) and heat distortion temperature (HDT) properties. An observation under the electronic scanning microscope discovered that among the polymer materials, the fibers modified by coupling agent exhibited better compatibility with polymer matrix than the non-treated fibers. Moreover the heat resistant property of polymer materials also improved after the addition of plant fibers. The HDT test showed that the HDT of pure PP was 80°C. However, after adding 60phr of bamboo fibers, its HDT reached up to 144.8°C with an increase of approximately 81%. In addition, a test with the universal tester has indicates that the addition of natural fibers was capable of increasing the mechanical property of PP. The tensile strength of pristine PP was 31.52Mpa, Whereas the composite material comprising 40phr of bamboo fibers would exhibit strength up to 51.89Mpa with an increase of approximately 66%. With regard to bending endurance, the bending endurance of pristine PP was 45.58Mpa, whereas when the composite material comprising 60phr bamboo fibers would exhibit bending endurance up to 73.9Mpa with an increase of approximately 62.1%. Moreover, the impact strength of pristine PP was 24.5J/m, whereas the composite material comprising 40phr bamboo fibers would exhibit impact strength up to 48.3J/m with an increase of approximately of 97.1%. In general, the addition of plant fibers not only would lower the costs of the materials, but also reduce the consumption of petrochemical plastics that would cause pollution. Moreover, it is also capable of enhancing agricultural development and cutting down agricultural wastes that would damage the environment.
Tsai, Chou-Yung, and 蔡州永. "A Study on Mechanical and Thermal Properties of Basalt Fiber Reinforced Polypropylene Composites." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/nuvsa5.
Повний текст джерела國立臺北科技大學
有機高分子研究所
100
Composites are a new material composed from two or more materials with different mechanical and chemical properties. They are normally formed by integrating organic and inorganic materials, taking the advantages of high stress, high hardness and thermal stability of inorganic ones, combined with the virtue of high toughness, the ability for processing of organic ones to produce a united material with characteristics of both. This study was to investigate the tensile properties and damage behavior of basalt staple fiber reinforced thermoplastic polypropylene composites. Various proportions of basalt staple fiber were added to the polypropylene, and the twin-screw mixer was applied for the evenly mixing result. Afterward, tensile specimens were obtained by using the injection molding machine. The decomposition temperature and weight loss rate of basalt staple fiber / polypropylene composite were analyzed by TGA. The variation in melting temperature was analyzed by DSC. A computer servo controlled tensile testing machine was used and the testing method was complied with the standard CNS4396 K6423. The results showed that the tensile elastic modulus increases with the increasing of basalt staple fibers. Also, while the added amount of basalt staple fiber was 12wt%, the proposed composite was with the largest yielding stress. For thermal properties, it was obviously that the inorganic fillers would raise the thermal decomposition temperature that would enhance its thermal stability.
Chia-Chuan, Chang, and 張家銓. "The Performances and Crystallization Effects of the Particle Size on the Talc Particles Reinforced Polypropylene Composites." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/242zeh.
Повний текст джерела崑山科技大學
材料工程研究所
107
In this study, PP/Talc composites were fabricated using a twin screw. To estimate the performances of the PP/Talc composites, mechanical properties, heat deflection temperature (HDT), thermomechanical analysis, and isothermal crystallization characterization were conducted. Incorporating talc particles increased the tensile strength, flexural properties, and HDT of the PP matrix, but reduced the elongation at break and notched impact strength. Moreover, the inclusion of talc particles in PP/Talc composites induced heterogeneous nucleation and considerably reduced the crystallization time. Consequently, the time required for processing was also greatly reduced.
(11201085), Ronald F. Agyei. "INVESTIGATING DAMAGE IN SHORT FIBER REINFORCED COMPOSITES." Thesis, 2021.
Знайти повний текст джерелаPhiri, Goitseona. "Fracture and failure behaviour of sisal fibre reinforced injection moulded composites." 2011. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000539.
Повний текст джерела"Clinoptilolite-polypropylene composites for the remediation of water systems polluted with heavy metals and phenolic compounds." Thesis, 2012. http://hdl.handle.net/10210/5076.
Повний текст джерелаIn this study, natural and modified clinoptilolite (CLI) reinforced polypropylene (PP) composites possessing improved mechanical and adsorptive properties were prepared through melt-mixing. Determination of morphological, structural and thermal properties was achieved by means of different techniques (FTIR, TGA, DSC, electron microscopy and x-ray spectroscopy). Electron microscopy revealed that increasing filler loading beyond 20% leads to agglomeration of clinoptilolite particles reducing their dispersion within the matrix. Thermal studies showed that the reinforced composites had a lower thermal stability than the neat PP polymer, suggesting that the clinoptilolite interfered with polymer chain arrangement and bonding. It also showed that percentage crystallinity increased with increasing filler loading indicating that the filler particles acted as nucleating agents within the polymeric matrix during composite synthesis. Prior to the ion-exchange studies, water sorption behaviour of fabricated composites was evaluated because ion-exchange/adsorption studies were to be performed in aqueous media. It was therefore observed that the hydrophobic polymer, PP attained the property of water sorption mainly due to the porous structure of the composites created by mixing and extrusion and also by the addition of the hydrophilic filler material.
Parveen, Bushra, Philip D. Caton-Rose, F. Costa, X. Jin, and P. Hine. "Study of injection moulded long glass fibre-reinforced polypropylene and the effect on the fibre length and orientation distribution." 2014. http://hdl.handle.net/10454/10763.
Повний текст джерелаLong glass fibre (LGF) composites are extensively used in manufacturing to produce components with enhanced mechanical properties. Long fibres with length 12 to 25mm are added to a thermoplastic matrix. However severe fibre breakage can occur in the injection moulding process resulting in shorter fibre length distribution (FLD). The majority of this breakage occurs due to the melt experiencing extreme shear stress during the preparation and injection stage. Care should be taken to ensure that the longer fibres make it through the injection moulding process without their length being significantly degraded. This study is based on commercial 12 mm long glass-fibre reinforced polypropylene (PP) and short glass fibre Nylon. Due to the semi-flexiable behaviour of long glass fibres, the fibre orientation distribution (FOD) will differ from the orientation distribution of short glass fibre in an injection molded part. In order to investigate the effect the change in fibre length has on the fibre orientation distribution or vice versa, FOD data was measured using the 2D section image analyser. The overall purpose of the research is to show how the orientation distribution chnages in an injection moulded centre gated disc and end gated plaque geometry and to compare this data against fibre orientation predictions obtained from Autodesk Moldflow Simulation Insight.
Hine, P., Bushra Parveen, D. Brands, and Philip D. Caton-Rose. "Validation of the modified rule of mixtures using a combination of fibre orientation and fibre length measurements." 2014. http://hdl.handle.net/10454/10647.
Повний текст джерелаThe goal of this study was to investigate the fibre orientation distribution (FOD), and subsequent mechanical properties, of an injection moulded plate with two different number averaged fibre lengths, termed in this paper medium (1.35 mm) and long (2.40 mm). Fibre orientation measurements (FOD) were made using the 2D elliptical section method and an in-house developed image analyser. The samples were injected from a pin gate located at the centre and top of the plate. Expansion flow on the divergent flow front from this pin gate resulted in a core region with circumferential alignment, while through thickness shear resulted in the usual realignment of fibres in the flow direction either side of the core, termed the shell layers. Two interesting aspects were discovered from these measurements. First, and most importantly, the FOD was found to be independent of the two fibre lengths in this study, and so predominantly controlled by the mould shape and the interaction with the flow front. Second, the fibres in the core region were found to be much closer packed than those in the shell regions. The interaction between the flow front and the mould shape resulted in a range of FOD across the moulded plate, from equal in-plane orientation at the centre of the plate, to highly aligned at the plate edge. This gave a very useful set of samples from which to test out the well known modified rule of mixtures (MROM). Often the fibre orientation distribution cannot be measured directly, but indirectly using the modified rule of mixtures model in reverse. The samples from this moulding (at two different average fibre lengths) gave an excellent opportunity to validate this often used approach. Both the tensile modulus and strength (measured parallel to the injection direction) were found to show a strong correlation with the measured fibre orientation, with a significant increase in both measures between the centre and the edge of both plates. The increased length of the ‘long’ fibre plate was found to give only a small increase in tensile modulus but a much larger increase in tensile strength. The tensile modulus showed a linear dependence with the measured fourth order orientation tensor average, 〈cos4 θ〉, with respect to the injection direction of the plate, as predicted by the modified rule of mixtures. Excellent agreement was found between the measured modulus and the predictions from the modified rule of mixtures, based only on measured quantities (matrix modulus, fibre fraction and average fibre length) for both plates.
Chang, Ying-Hung, and 莊英鴻. "Study of the Mechanical Properties of Glass Fiber Woven Sheet Reinforced Polypropylene Honeycomb Sandwich Composite." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/69238073650452339867.
Повний текст джерела桃園創新技術學院
應用科技研究所
104
In this study, we prepared composite materials of sandwich structure with glass fiber woven sheet and polypropylene honeycomb structure by hot press method, then and discussed the mechanical properties of that. In this experiment, four kinds of layer (1, 2, 4 and 6) of glass fiber woven sheet as reinforced material laminated at the top and bottom of four thicknesses( 5, 10, 15 and 20mm) of polypropylene honeycomb structure, respectively. The experimental results show that the optimum value of specific bending strength appears that the 6 layers glass fiber woven sheet reinforced 5mm thickness of polypropylene honeycomb structure and the thickness of polypropylene honeycomb structure was increasing, specific bending strength of composite of sandwich structure was decreased. We also found that maximum value of specific bending modulus appears at the 2 layers glass fiber woven sheet reinforced 5mm thickness of polypropylene honeycomb structure and the layers of glass fiber woven sheet was increasing, the specific bending strength of composite of sandwich structure was decreased. Finally, the maximum value of specific impact strength show that the 6 layers glass fiber woven sheet reinforced 20 mm thickness of polypropylene honeycomb structure and the layers of glass fiber woven sheet was increasing , the specific impact strength of composite of sandwich structure was increased.