A Study On Preparation And Mechanical Properties Of Long Jute Fiber Reinforced Polylactic Acid By The Injection Molding Process

WIT Transactions on State-of-the-art in Science and Engineering Pub Date : 2015-12-09 DOI:10.2495/978-1-78466-167-0/012

T. Fujiura, K. Sakamoto, Tatsuya Tanaka, Y. Imaida

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引用次数: 4

Abstract

Natural plant fibers have recently attracted attention as reinforcements for plastics due to their high specific mechanical properties and carbon neutrality. This study explored the preparation process for long jute fiber reinforced polylactic acid (LJF/PLA) pellets for injection molding and the mechanical performance of the molded composites. The originally fabricated pultrusion process for manufacturing long fiber reinforced thermoplastic (LFT) was capable of preparing LJF/PLA pellets, with the excellent impregnation of resin into jute fiber bundles. The incorporation of jute fibers of 50 mass% into PLA resulted in the improvement of flexural strength and modulus of injection molded composites. On the other hand, jute reinforcement was not effective for increasing the impact strength of the composite. Moreover, this study also investigated the influence of the moisture that had remained in jute fibers on the mechanical properties of the LJF/PLA composites. As the moisture content of jute fiber increased, the average molecular weight of matrix PLA in the LJF/PLA lowered due to the hydrolysis, and consequently the mechanical properties of the composites decreased. Eliminating moisture from jute fibers in the preparation process of LJF/PLA pellets was found to be important for preventing the deterioration in the molecular weight of PLA and the properties of the molded composites.

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注射成型制备长黄麻纤维增强聚乳酸及其力学性能研究

近年来，天然植物纤维因其高比机械性能和碳中性而成为塑料的增强材料。研究了长黄麻纤维增强聚乳酸(LJF/PLA)注射成型微球的制备工艺及成型复合材料的力学性能。原制备的长纤维增强热塑性塑料(LFT)的拉挤工艺能够制备出LJF/PLA球团，树脂在黄麻纤维束中具有良好的浸渍性。在PLA中掺入质量为50%的黄麻纤维，可提高注塑复合材料的抗弯强度和模量。另一方面，黄麻增强剂对提高复合材料的冲击强度没有效果。此外，本文还研究了黄麻纤维中残留水分对LJF/PLA复合材料力学性能的影响。随着黄麻纤维含水量的增加，LJF/PLA中基体PLA的平均分子量因水解而降低，从而导致复合材料的力学性能下降。在制备LJF/PLA球团的过程中，去除黄麻纤维中的水分对防止PLA分子量的下降和模制复合材料的性能至关重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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WIT Transactions on State-of-the-art in Science and Engineering

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