Inhomogeneity of Interface Modification of Carbon Fiber/Epoxy Composites

doi:10.11901/1005.3093.2022.352

Chinese Journal of Materials Research

2023, Vol. 37

Issue (9): 668-674 DOI: 10.11901/1005.3093.2022.352

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Inhomogeneity of Interface Modification of Carbon Fiber/Epoxy Composites

WANG Qian¹, PU Lei¹, JIA Caixia¹(

), LI Zhixin², LI Jun¹

^1.College of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China
^2.Shenyang Aircraft Maintenance & Overhaul Base, China Southern Airlines Company Limited, Shenyang 110169, China

Cite this article:

WANG Qian, PU Lei, JIA Caixia, LI Zhixin, LI Jun. Inhomogeneity of Interface Modification of Carbon Fiber/Epoxy Composites. Chinese Journal of Materials Research, 2023, 37(9): 668-674.

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Abstract

The effect of plasma surface modification and plasma grafting modification on the inhomogeneity of interfacial properties of the modified carbon fiber/epoxy composites was comparatively studied by means of interlaminar shear strength (ILSS) test, metallography, SEM, attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIS) in terms of the relevant affecting factors. Firstly, the interlaminar shear strength (ILSS) of the composites was measured and its variation was evaluated.Results showed that the enhancement rate of ILSS by plasma surface modification was only 8.6%, while that by plasma grafting was 37% by the same plasma treatment conditions. However, compared with the plasma surface modification, the plasma graft modification aggravated the dispersion of ILSS. Then the surface morphology and the adhesion situation to the resin matrix of the carbon fibers modified by the two methods were studied by scanning electron microscope and metallographic microscope, respectively. Fourier transform infrared spectroscopy was used to reveal the chemical reactions on the fiber surface. The results showed that compared with the plasma surface modification, the plasma grafting modification could graft more active groups onto carbon fibers through substitution reaction, which may result in the improvement of interfacial properties. However, due to the inhomogeneity of grafting layer, which may cause the increase of the fiber adhesion and aggregation, thereby the ILSS dispersion of composites after grafting modification was expanded. Therefore, the control of plasma grafting modification on the homogeneity of interfacial property for composites deserves more attention. This study can provide some theoretical guidance for composite interface modification and its homogeneitycontrol.

Key words: surface and interface in the materials degree of dispersion plasma modification inhomogeneity

Received: 28 June 2022

ZTFLH:

TB332

Fund: Research Project of China Society for Degree and Postgraduate Education(2020ZDB80);Liaoning Provincial Education Department Project(JYT2020012&JYT2020014)

Corresponding Authors: JIA Caixia, Tel: (024)89723720, E-mail: jiacaixia@sau.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.352 OR https://www.cjmr.org/EN/Y2023/V37/I9/668

Fig.1 Process of carbon fiber modification and its composites preparation

Table 1 Sample codes for carbon fibers and carbon fiber/epoxy resin composites

Table 2 Interlaminar shear strength of composites under different plasma treatment conditions

Fig.2 Variation of ILSS and its deviation after modification with different grafting concentrations

Fig.3 SEM images of carbon fibers before and after different treatments (a) Untreated CF, (b) CF-300, (c) CF-300-5, and (d) CF-300-5 after acetone extraction

Fig.4 Metallographic micrographs of composites before and after different modifications (a) Untreated CF/EP, (b) CF-300/EP, (c) CF-300-5/EP

Fig.5 Infrared spectra of carbon fiber surface before and after surface/grafting modification (a) full spectrum and (b) magnified view of 800~830 cm^-1 region

Fig.6 A comparative analysis of IR spectra of the carbon fibers with different grafting concentrations (a) full spectrum, and (b) magnified view of 800~830 cm^-1 region

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