偶联剂和碱处理对亚麻纤维增强PLA复合材料力学、热学和形态性能的影响

IF 1.8 4区 材料科学 Q4 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Green Materials Pub Date : 2021-09-13 DOI:20.00062
Ali Avci, Aysegul Akdogan Eker, Mehmet Safa Bodur
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引用次数: 0

摘要

本研究采用挤压法制备了三种不同类型的聚乳酸(PLA)和短亚麻纤维生物复合材料。为了提高亚麻纤维与PLA基体的界面附着力,在挤压前对亚麻纤维进行了碱处理。研究了偶联剂和碱处理对复合材料力学性能、热学性能和热机械性能的影响。结果表明,偶联剂对复合材料的热性能、热力学性能和力学性能都有良好的影响。与纯PLA样品相比,复合材料的弯曲模量和拉伸模量显著提高。动态力学热分析和热重分析(TGA)结果表明,与纯PLA和添加偶联剂的复合材料相比,PLA/亚麻纤维复合材料的损失模量和储存模量都有所提高。热重分析表明,在PLA中加入亚麻纤维后,PLA的热稳定性得到改善。此外,添加偶联剂的PLA中亚麻纤维含量提高了PLA的拉伸强度、弯曲强度和弯曲模量。碱处理亚麻纤维的抗拉强度比未处理亚麻纤维提高了50 MPa。采用傅里叶变换红外光谱法研究了碱处理和未处理亚麻纤维复合材料的化学组成和官能团的相互作用。
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Effect of coupling agent and alkali treatment on mechanical, thermal and morphological properties of flax-fiber-reinforced PLA composites
In the current study, three different types of biocomposites based on poly(lactic acid) (PLA) and short flax fiber were produced using extrusion. Alkali treatment was conducted on the flax fiber before the extrusion process in order to improve the interfacial adhesion between the flax fiber and the PLA matrix. The influence of the coupling agent and alkali treatment on the composite materials was investigated with regard to the mechanical, thermal and thermomechanical properties of the injected composites. The results show that the coupling agent has a favorable effect on the thermal, thermomechanical and mechanical properties of the composites. The flexural and tensile moduli of the composites were significantly enhanced compared with those of pure PLA samples. Dynamic mechanical thermal analysis and thermogravimetric analysis (TGA) results indicate that the loss and storage modulus of PLA/flax fiber composites are increased compared with those of both pure PLA and composites with the coupling agent. The TGA showed that the thermal stability of PLA improved with the addition of flax fiber into PLA. Additionally, the developed flax fiber content in PLA with the coupling agent improved the tensile, flexural strength and flexural modulus. The tensile strength of the alkali-treated flax fiber increased up to 50 MPa compared with that of the untreated flax fiber. The Fourier transform infrared spectroscopy method was carried out to examine the chemical composition of the composite and interaction of functional groups for both alkali-treated and untreated flax fibers.
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来源期刊
Green Materials
Green Materials Environmental Science-Pollution
CiteScore
3.50
自引率
15.80%
发文量
24
期刊介绍: The focus of Green Materials relates to polymers and materials, with an emphasis on reducing the use of hazardous substances in the design, manufacture and application of products.
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