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

GU Shaohua; LI Haoyuan; ZHANG Wenfu; WANG Cuicui; LI Mingpeng; CHENG Haitao; WANG Ge

doi:10.13801/j.cnki.fhclxb.20230904.002

Volume 41 Issue 4

Apr. 2024

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GU Shaohua, LI Haoyuan, ZHANG Wenfu, et al. Effect of alkali treatment on the wettability and tensile failure of twisted bamboo fiber/epoxy composites[J]. Acta Materiae Compositae Sinica, 2024, 41(4): 1870-1878. doi: 10.13801/j.cnki.fhclxb.20230904.002

Citation:

GU Shaohua, LI Haoyuan, ZHANG Wenfu, et al. Effect of alkali treatment on the wettability and tensile failure of twisted bamboo fiber/epoxy composites[J]. Acta Materiae Compositae Sinica, 2024, 41(4): 1870-1878. doi: 10.13801/j.cnki.fhclxb.20230904.002

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

doi: 10.13801/j.cnki.fhclxb.20230904.002

1.
Key Lab of Bamboo and Rattan Science and Technology, Intenational Centre for Bamboo and Rattan, Beijing 100102, China
2.
Zhejiang Forestry Academy, Hangzhou 310023, China

Funds: National Natural Science Foundation of China (32371979); National Key R&D Program of China (2022YFD2200903)

Received Date: 2023-07-05
Accepted Date: 2023-08-20
Rev Recd Date: 2023-08-11

Available Online: 2023-09-06

Publish Date: 2024-04-15

Abstract

Abstract

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.
- bamboo fiber,
- twisted structure,
- composite,
- wettability,
- failure mechanism
Long Abstrsct
Innovation Points

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References(36)

References

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