Mechanical and Biodegradable Properties of Jute/Flax Reinforced PLA Composites

다국어 초록 (Multilingual Abstract)

Green composites possessing biodegradable or recyclable characteristics have gained interest in recent years dueto their ecofriendly, sustainable and lightweight characteristics over the conventional plastic-based materials. In this study,flax and jute natural fibers have been used individually and as hybrid reinforcement into Poly Lactic Acid (PLA) matrix. Thecomposites developed are suitable to be used in biodegradable products in packaging and automobile industries. Hot presscompression molding was used to fabricate samples of PLA/flax, PLA/jute and PLA/flax/jute (hybrid composites). Theconcentration of natural fibers in individual fiber-based composites was varied (between 0-50 %) by weight to investigate itseffect on tensile and impact properties. Maximum tensile properties were obtained for 40 wt% single-fiber reinforced intoPLA. This reinforcement content (40 wt%) was used as reference for hybrid composites. Hybrid composites were fabricatedwith different combinations of jute and flax fibers by keeping the total concentration of reinforcement equal to 40 % byweight. Tensile and Charpy impact tests were performed to evaluate the mechanical properties of the composites. ScanningElectron Microscopy of the tensile fractured surfaces was performed to observe the failure mechanism and adhesion at fibermatrixinterfaces in the composites. Further characterizations included Fourier Transform Infra-Red spectroscopy andBiodegradability tests, which were performed according to ASTM standards. Fourier Transform Infrared analysis revealedinteraction between the natural fibers (jute and flax) and PLA matrix in hybrid composites. The enhanced interaction inhybrid composites resulted in their improved impact resistance. Based on the results obtained in this study, the improvedmechanical and biodegradable properties of these composites make it suitable for use in applications like food-packaging andindoor plastic products in automobiles, to reduce synthetic plastic pollution.

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