Examination of water uptake performance and mechanical properties of PLA/flax fiber biocomposites with the coupling agent

A. Avcı, Ayşegul Akdogan Eker, M. Bakkal, M. Bodur
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引用次数: 1

Abstract

The paper reports, the effect of water sorption on the microstructural and flexural properties of the flax fiber/ polylactic acid (PLA) biocomposites compared to the composites with maleic anhydride (MAH) as coupling agents and alkali treatment. In the current study, five different biocomposites which are 15 % wt. flax/PLA, 25 % wt. flax/PLA as control group and15 % wt. flax/PLA, 25 % wt. flax /PLA, and 35% wt. flax / PLA with 5 % wt. MAH was produced. Ten different soaking times were studied to understand the water absorption behavior of the biocomposites. To investigate mechanical properties of the biocomposites impact test was applied on the dry and 750 h, 1850 h water sorption composites. A three-point bending test was performed on the dry and 1850 h water sorption biocomposites to determine flexural properties. Short flax fiber-reinforced PLA matrix biocomposites were compounded using extrusion and manufactured by injection molding. Flax fiber surface was treated using sodium hydroxy solution to advance the interface interaction between fiber-matrix and surface performance of the fiber and matrix. According to the results, alkali treatment improved the water gain resistance of the composites since its enhancement of the interfacial bonding. Alkali-treated composites with maleic anhydride showed the better impact and flexural strength than composites without alkali-treated after 1850 h water sorption.
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偶联剂对聚乳酸/亚麻纤维生物复合材料吸水性能和力学性能的影响
本文报道了吸水率对亚麻纤维/聚乳酸(PLA)生物复合材料微观结构和弯曲性能的影响,并与以马来酸酐(MAH)为偶联剂和碱处理的复合材料进行了比较。本研究以15%亚麻/PLA、25%亚麻/PLA为对照组,以15%亚麻/PLA、25%亚麻/PLA、35%亚麻/PLA和5% MAH为对照,制备了5种不同的生物复合材料。研究了10种不同浸泡时间对生物复合材料吸水性能的影响。为研究生物复合材料的力学性能,对干燥、750 h、1850 h的吸水复合材料进行了冲击试验。对干燥和1850 h的吸水生物复合材料进行三点弯曲试验,以确定其弯曲性能。采用挤压法制备了短亚麻纤维增强聚乳酸基生物复合材料。采用氢氧化钠溶液对亚麻纤维表面进行处理,提高纤维与基体的界面相互作用,提高纤维与基体的表面性能。结果表明,碱处理增强了复合材料的界面结合,提高了复合材料的抗水增益性能。经马来酸酐碱处理的复合材料在吸水1850 h后的抗冲击强度和抗弯强度均优于未经碱处理的复合材料。
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