Effect of alkali treatment on the wettability and tensile failure of twisted bamboo fiber/epoxy composites

被引：0
|
作者：
Gu S. [1 ]
Li H. [1 ]
Zhang W. [1 ,2 ]
Wang C. [1 ]
Li M. [1 ]
Cheng H. [1 ]
Wang G. [1 ]
机构：
[1] Key Lab of Bamboo and Rattan Science and Technology, Intenational Centre for Bamboo and Rattan, Beijing
[2] Zhejiang Forestry Academy, Hangzhou
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2024年 / 41卷 / 04期
基金：
中国国家自然科学基金;
关键词：
bamboo fiber; composite; failure mechanism; twisted structure; wettability;
D O I：
10.13801/j.cnki.fhclxb.20230904.002
中图分类号：
学科分类号：
摘要：
The twisted bamboo fiber (TBF) was used as the reinforcement phase and the epoxy resin-anhydride system as the matrix phase to prepare the twisted bamboo fiber/epoxy resin (TBF/EP) composite. The effects of alkali treatment on the wettability and tensile failure of TBF/EP composites were investigated by varying the concentration of NaOH solution (1wt%-5wt%). Nano-scale and micro-scale experimental techniques, such as SEM, surface tension testing, and in-situ loading, were employed to analyze the fiber-resin interface, wetting properties, and tensile mechanical properties of the composites. The results show that alkali treatment reduces the surface energy and polarity of the fibers, resulting in a decrease in the wetting force between TBF and the matrix from 0.45 mN to 0.1 mN. The TBF/EP composite modified with 3wt%NaOH solution exhibits a tensile strength (TS) of 273.70 MPa, which is 178.64% higher than that of the untreated composite. In-situ analysis reveals that the failure process of TBF involves fiber fracture and fiber sliding, while the failure process of the TBF/EP composite includes matrix shear yielding and fiber fracture. Moreover, as the wetting properties improve, the inhibitory effect of the fibers on matrix yielding increase. Therefore, the strength of the TBF/EP composite is mainly derived from the reinforcement of the fibers and the interface, which is influenced by wetting properties and stress transfer effect between TBF and matrix. © 2024 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：1870 / 1878
页数：8
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