Effect of steam explosion and silanization of hemp fibers on polylactic acid biocomposites; analysis of mechanical-thermal properties and fungal biodegradation

IF 3.6 4区材料科学 Q2 MATERIALS SCIENCE, COMPOSITES

Journal of Thermoplastic Composite Materials Pub Date : 2023-12-09 DOI:10.1177/08927057231219946

N. Khanoonkon, Kunat Kongsin, Wannapa Jampanit, Chinchuta Chanwetwirot, Ramitanun Malakul, R. Chollakup, Suteera Witayakran‬, P. Chatakanonda, J. Boonyarit, T. Kittikorn

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引用次数: 0

Abstract

Alkaline pretreated hemp fibers were modified by steam explosion and/or silanization before being compounded with polylactic acid (PLA). The fungal biodegradation of the PLA/hemp fibers composite was investigated using Aspergillus niger TISTR 3153 in an aqueous medium for 28 days, following the ISO 846: 1997 standard method. The influence of the different physicochemical modifications of hemp fibers on the fungal biodegradation of the composite was evaluated in terms of molecular weight, chemical structure, mechanical properties, thermal properties, and hygroscopic properties. The results showed that the modulus of all composites were averagely increased by 109%, compared to neat PLA. All the PLA/hemp fiber composites better retained their properties after fungal biodegradation than neat PLA. Therefore, the physicochemical treatments of fibers after alkaline pretreatment promoted the resistance of the composite to fungal biodegradation. The treatment of hemp fibers in the present work was alkalization followed by silanization, which resulted in a PLA-based composite that was suitable for outdoor applications.

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麻纤维汽爆和硅烷化对聚乳酸生物复合材料的影响；机械热性能和真菌生物降解分析

在与聚乳酸(PLA)复合之前，对碱预处理的大麻纤维进行蒸汽爆炸和/或硅烷化改性。采用ISO 846: 1997标准方法，用黑曲霉TISTR 3153在水介质中对PLA/大麻纤维复合材料进行28天的真菌生物降解研究。从分子量、化学结构、力学性能、热性能和吸湿性能等方面考察了大麻纤维的不同理化改性对真菌降解复合材料的影响。结果表明，与纯PLA相比，复合材料的模量平均提高了109%。所有PLA/大麻纤维复合材料在真菌生物降解后的性能都优于纯PLA。因此，碱预处理后纤维的理化处理提高了复合材料对真菌生物降解的抗性。在目前的工作中，大麻纤维的处理是碱化，然后是硅烷化，这导致了一种适合户外应用的pla基复合材料。

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来源期刊

Journal of Thermoplastic Composite Materials 工程技术-材料科学：复合

CiteScore

8.00

自引率

18.20%

发文量

104

审稿时长

5.9 months

期刊介绍： The Journal of Thermoplastic Composite Materials is a fully peer-reviewed international journal that publishes original research and review articles on polymers, nanocomposites, and particulate-, discontinuous-, and continuous-fiber-reinforced materials in the areas of processing, materials science, mechanics, durability, design, non destructive evaluation and manufacturing science. This journal is a member of the Committee on Publication Ethics (COPE).