Effect of Plasma Treatment on Interfacial Properties of CF/PI Composites at Elevated Temperatures

doi:10.11901/1005.3093.2023.189

Chinese Journal of Materials Research

2023, Vol. 37

Issue (12): 900-906 DOI: 10.11901/1005.3093.2023.189

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Effect of Plasma Treatment on Interfacial Properties of CF/PI Composites at Elevated Temperatures

DONG Zhexuan¹, CHEN Ping¹^,²(

), LIU Xingda¹

^1.State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
^2.Key Laboratory of Materials Modification by Laser, Ion and Electron Beams of Ministry of Education, Dalian University of Technology, Dalian 116024, China

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DONG Zhexuan, CHEN Ping, LIU Xingda. Effect of Plasma Treatment on Interfacial Properties of CF/PI Composites at Elevated Temperatures. Chinese Journal of Materials Research, 2023, 37(12): 900-906.

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Abstract

The interfacial properties of modified carbon fiber reinforced polyimide resin matrix composites at 300℃ were studied by using argon inductively coupled radio-frequency plasma (ICP). Scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray electron spectroscopy (XPS) and other analytical test methods were used to systematically study the effects of argon plasma treatment time on the morphology, roughness and chemical composition of fiber surface before and after continuous carbon fiber modification, and the change law of the interface strength of Carbon fiber reinforced polyimide resin matrix (CF/PI) composites at 300℃. The results show that after the optimal time of argon plasma treatment for 7 min, the morphology of the carbon fiber surface becomes rough, the structural characteristics of unevenness appear, the surface oxygen element content increases from 11.43% to 16.28%, the polar functional group -C-O- content increases to 14.37%, and the wettability of the fiber surface increases. The interlayer shear strength (ILSS) value of carbon fiber and polyimide resin matrix increased from 76 MPa to 86.2 MPa at 300℃, indicating that argon plasma treatment can improve the interfacial properties of CF/PI composites at 300℃.

Key words: composites plasma carbon fiber interfacial strength polyimide composites

Received: 20 March 2023

ZTFLH:

TB332

Fund: National Key Research Program(2019-ZD-380-12);National Natural Science Foundation of China(51873109)

Corresponding Authors: CHEN Ping, Tel: (411)84986100, E-mail: pchen@dlut.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.189 OR https://www.cjmr.org/EN/Y2023/V37/I12/900

Fig.1 SEM images of the carbon fiber treated for different time by argon plasma (a) untreated; (b) 5 min; (c) 7 min; (d) 15 min

Fig.2 AFM images of the carbon fiber treated for different time by argon plasma untreated; (b) 5 min; (c) 7 min; (d) 15 min

Table 1 Roughness of carbon fiber surface treated for different time by argon plasma

Table 2 Relative elemental concentration of the carbon fiber surface treated by argon plasma for different time

Fig.3 XPS Cls spectra of the carbon fiber surface treated for different time by argon plasma (a) untreated; (b) 5 min plasma treatment; (c) 7 min plasma treatment; (d) 15 min plasma treatment

Fig.4 Contact angle of carbon fiber treated for different time by argon plasma

Table 3 Concentration of functional groups on the carbon fiber surface treated for different time by argon plasma

Fig.5 Single fiber tensile strength of carbon fiber treated for different time by argon plasma

Fig.6 ILSS of CF/PI composites treated for different time by argon plasma at 300℃

Treatment time / min	$τ 1$ / MPa	$τ 2$ / MPa	Retention rate / %
0	89.77	76.0	84.66
7	108.78	86.2	79.24

Table 4 Retention rate of ILSS of CF/PI composites

Fig.7 Water absorption rate of CF/PI composites before and after air plasma treatment

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