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Journal ArticleDOI

Jute reinforced polyester structures

01 Apr 1984-Polymer Composites (Wiley)-Vol. 5, Iss: 2, pp 141-142
TL;DR: In this paper, a modified filament winding machine is used to take the jute cloth on the rotating mold acting as a collapsible mandrel and the effect of calendering, fillers and poly(vinyl acetate) on jute reinforcing cloth and the results on the ultimate mechanical properties of the composite are studied.
Abstract: Large diameter pipes and structures are manufactured with jute reinforced polyester resin. A modified filament winding machine is used to take the jute cloth on the rotating mold acting as a collapsible mandrel. The effect of calendering, fillers and poly(vinyl acetate) on jute reinforcing cloth and the results on the ultimate mechanical properties of the composite are studied. The effect of load during the curing of polyester and its effect on the strength of structure is reported. These findings are used in manufacturing of large diameter structures with improved mechanical properties.
Citations
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Journal ArticleDOI
TL;DR: In this article, the advancement in the application of cellulose-based materials in different sectors with a discussion of fundamental research in these areas is discussed, and a review aims to analyze the advancement of celluloside based materials in various sectors.
Abstract: Natural fiber reinforced polymer composites are lightweight, economical and available in a variety of forms. They have low densities, comparable material properties, high molding flexibility and are environmentally friendly, making them a conceivable alternative to traditional fillers like mica, calcium carbonate and glass. By modifying either the resin system or the natural fiber, biocomposites can be designed for different applications ranging from products of commodity to aerospace, examples including electroactive papers, fuel cell membranes, controlled drug release mechanisms and biosensors. This review aims to analyze the advancement in the application of cellulose based materials in different sectors with a discussion of fundamental research in these areas.

349 citations

Journal ArticleDOI
TL;DR: Jute fiber is an important agricultural product in Third World countries such as India, China, Bangladesh, etc. as discussed by the authors The jute industry has special importance in the economy of India and continues to be a major traditional earner of foreign exchange.
Abstract: Jute fiber is an important agricultural product. It is one of the most common natural fibers in Third World countries such as India, China, Bangladesh, etc. The jute industry has special importance in the economy of India and continues to be a major traditional earner of foreign exchange. However, it is facing tough competition from the synthetic fibers. Jute fibers find use in sophisticated fields like decorative and furnishing materials such as lamp shades, wall covers, curtains, upholsteries, etc. Today it is the least expensive fiber of mass consumption, at only a fraction of the cost of glass fibers; in terms of volume, jute is now the second most important fiber in the world, next to cotton. In the traditional applications in carpets, ropes, sacks, etc., jute fibers have been partially replaced by synthetic fibers which have some advantages compared to jute. In order to ensure a reasonable return to farmers, nontraditional outlets have to be explored for the fiber. One such avenue is in the...

229 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of maleic anhydride on the swelling and mechanical properties of plant fiber polymer composites has been assessed and the impact strength and Shore-D hardness have been found to be higher in maleic-anhydride-treated fiber composites than the untreated-fiber composites.

189 citations

Journal ArticleDOI
TL;DR: In this article, an epoxy functional-y-glycidoxypropyltrimethoxy-silane (A-187 from Osi-Specialtis GmbH, Germany) was used as a coupling agent between fiber and matrix.
Abstract: The composites investigated in this article were epoxy resins reinforced with jute-fibers. The jute-fibers were modified with an epoxyfunctional-y-glycidoxypropyltrimethoxy-silane (A-187 from Osi-Specialtis GmbH, Germany), which works as a coupling agent between fiber and matrix. The introduction of the coupling agent distinctly influences the mechanical properties of the composite: Dynamic modulus was doubled, damping was reduced by about 50%, and the Wohler curves showed fatigue limits increased by about 20%. The investigations pointed out further that the moisture uptake of composites with silanized fibers was reduced by about 10-20%. Moisture at equilibrium and kinetics of absorption increase with increasing fiber content. Finally, the application of the coupling agent caused a reduction of moisture effects on mechanical properties. Tensile strength, tensile modulus, and fatigue strength under repeated tensile stress were reduced up to 30%. This tendency was not duplicated in the results for flexural strength and flexural modulus.

127 citations

Journal ArticleDOI
TL;DR: In this article, the influence of water absorption-desorption cycles on the mechanical properties of natural fiber reinforced plastics was discussed, and light microscopic investigations showed that absorption-deponding of fibers led to debonding of resin from fibers as well as to cracks in the adjacent resin.
Abstract: The goal of this paper is to discuss the influence of water absorption-desorption cycles on the mechanical properties of natural fiber reinforced plastics. Therefore, epoxy resins with jute wovens as reinforcement with untreated and silane treated fibers were investigated. Silane treatment of fibers led to increased tensile, flexural strength, and Young's modulus of composites with up to 30%. Absorption-desorption cycles of fibers changed the fracture mechanisms of fibers without having significant effects on the tensile strength of the fibers. Light microscopic investigations showed that absorption-desorption cycles of composites led to the debonding of resin from fibers as well as to cracks in the adjacent resin. Because of these mechanisms, tensile strength and Young's modulus decrease, independent of the quality of fiber resin adhesion. For dynamic loadings, storage cycle induces damages, further bringing about a decreased dynamic modulus and an increased progress in damage with increasing load cycles during the first two environmental cycles, being constant afterwards.

103 citations

References
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Journal ArticleDOI
TL;DR: In this paper, a critical account of the recent investigation on the chemical modification of lignocellulosic sisal fibers is presented, where the molecular structure of the paracrystalline cellulose, which forms the major constituent of the fiber, was studied by x-ray diffraction technique.
Abstract: A critical account has been presented of the recent investigation on the chemical modification of lignocellulosic sisal fibers. The molecular structure of the paracrystalline cellulose, which forms the major constituent of the fiber, was studied by x-ray diffraction technique. Scanning electron microscope examination of the multicellular structure, surface topology, and fracture morphology of the fiber was carried out. The mechanical properties of the sisal ultimate cell and the “technical” fiber have been investigated by means of a microextensometer and an Instron tensile tester, respectively.

100 citations