Strengthening-toughening design method of carbon fiber/epoxy resin interface

doi:10.19936/j.cnki.2096-8000.20230828.002

Abstract

Abstract: To improve the interfacial strength and toughness of carbon fiber/epoxy resin composites simultaneously, a novel “rigid-soft” interface layer was constructed via dispersing rigid multi-walled carbon nanotubes (MWCNT) and soft thermoplastic polyurethane (TPU) in N, N-Dimethylformamide solution by ultrasonic and depositing them on carbon fiber surface by dip-coating technique. Scanning electron microscopy, atomic force microscopic, fourier transform infrared spectroscopy and Raman spectroscopy were used to characterize the surface of CF. The interfacial shear strength (IFSS) and pull-out displacement of CF/epoxy resin composites were tested by fiber pull-out testing. The results show that: MWCNT and TPU can uniformly distributed on the surface of CF by above method. Compared with pristine CF, the IFSS and pull-out displacement of modified CF were respectively improved by 163.3% and 52.8% due to the hydrogen bonding and mechanical interlocking between MWCNT and TPU, which indicates the “rigid-soft” interface layer have a positive effect on the enhancement for the interfacial strength and toughness of carbon fiber/epoxy resin composites.

Key words: composites, strengthening-toughening design, interfacial shear strength, interfacial toughness

CLC Number:

TB332

WANG Qinyu, ZHUO Jiagui, LI Xinding, DU Pengcheng, WANG Wen, ZHU Dalei, TAN Jianping. Strengthening-toughening design method of carbon fiber/epoxy resin interface[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(8): 14-18.

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