Performance of Interlayer Toughened Carbon Fiber/Epoxy Composites of Polyethersulfone Porous Fiber Veil

doi:10.11901/1005.3093.2022.653

Chinese Journal of Materials Research

2024, Vol. 38

Issue (1): 33-42 DOI: 10.11901/1005.3093.2022.653

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Performance of Interlayer Toughened Carbon Fiber/Epoxy Composites of Polyethersulfone Porous Fiber Veil

LI Zhaoyang¹^,², XUE Yi¹^,², YANG Zehao¹^,², ZHAO Qingzhi¹^,², PENG Yanshuang¹^,², LIU Yong¹^,², YANG Jianping¹, ZHANG Hui¹^,²(

)

1 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, School of Materials Science and Engineering, Donghua University, Shanghai 201620, China
2 Center for Civil Aviation Composites, Donghua University, Shanghai 201620, China

Cite this article:

LI Zhaoyang, XUE Yi, YANG Zehao, ZHAO Qingzhi, PENG Yanshuang, LIU Yong, YANG Jianping, ZHANG Hui. Performance of Interlayer Toughened Carbon Fiber/Epoxy Composites of Polyethersulfone Porous Fiber Veil. Chinese Journal of Materials Research, 2024, 38(1): 33-42.

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Abstract

In order to improve the interlaminar toughness of carbon fiber/epoxy (CF/EP) composites, polyethersulfone (PES) porous fibers were prepared by wet spinning, and four PES porous fiber veils (PESV) with different areal densities were prepared by wet-laid method, which were subsequently used for interlaminar toughening of CF/EP composites by vacuum-assisted resin infusion molding (VARI). The dissolution behavior of PES porous fibers in epoxy resin, the mode I (G_IC) and mode II (G_IIC) interlaminar fracture toughness, the interlaminar shear strength and flexural properties of the composites were systematically examined, and the interlaminar fracture microscopic morphology of the composites was also characterized. The results showed that the PES porous fibers were completely dissolved in the epoxy resin at the curing temperature of 180^oC; The G_IC and G_IIC of CF/EP composites were best at the areal density of 31.6 g/m², which increased by 54.4% and 62.2%, respectively, which may be ascribed to that the phase separation of PES porous fibers dissolved in epoxy resin resulted in a two-phase PES/epoxy structure, thereby, improved the interlayer toughness; The interlaminar shear strength, flexural strength and flexural modulus of CF/EP composites also increased by 2.9%, 4.0% and 7.7%, respectively, for the areal density of 21.9 g/m².

Key words: composite carbon fiber interlaminar toughen polyethersulfone fiber veil

Received: 09 December 2022

ZTFLH:

TB332

Fund: Shanghai Commission of Science and Technology "Science and Technology Innovation Action Plan"(20511107300);National Key Research and Development Program of China(2022YFB3709202)

Corresponding Authors: ZHANG Hui, Tel: 13681792738, E-mail: zhanghui@dhu.edu.cn

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	LI Zhaoyang
	XUE Yi
	YANG Zehao
	ZHAO Qingzhi
	PENG Yanshuang
	LIU Yong
	YANG Jianping
	ZHANG Hui

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.653 OR https://www.cjmr.org/EN/Y2024/V38/I1/33

Fig.1 PES porous fiber photos and microscopic SEM images (a) PES fiber photos, (b, c) surface microscopic morphologies and (d) cross-sectional microscopic morphology

Fig.2 Photos of PESV morphologies with different areal densities (a) 14.2 g/m², (b) 21.9 g/m², (c) 31.6 g/m² and (d) 40.0 g/m²

Fig.3 Morphology of PES fibers in epoxy resin at different temperatures (a~c) isothermal infusion process, (d~f) heating process from 100^oC to 180^oC and (g~i) isothermal curing process

Fig.4 Test results of mode I interlaminar fracture toughness of PESV interlaminar toughened CF/EP composites with different areal densities (a) G_IC and (b) R-curve

Fig.5 SEM images of G_IC fracture surfaces of PESV interlayer toughened CF/EP composite with different areal densities (a) Ref., (b) PESV @ 14.2, (c) PESV @ 21.9, (d) PESV @ 31.6 and (e) PESV @ 40.0

Fig.6 SEM images of G_IC fracture surfaces of PESV interlayer toughened CF/EP composite etched with NMP (a) Ref., (b) PESV @ 14.2, (c) PESV @ 21.9, (d) PESV @ 31.6 and (e) PESV @ 40.0

Fig.7 Mode II interlaminar fracture toughness of PESV interlaminar toughened CF/EP composites with different areal densities

Fig.8 SEM images of mode II fracture surfaces of PESV interlayer toughened CF/EP composite with different areal densities (a) Ref., (b) PESV @ 14.2, (c) PESV @ 21.9, (d) PESV @ 31.6 and (e) PESV @ 40.0

Fig.9 Interlaminar shear strength values of PESV interlaminar toughened CF/EP composites with different areal densities

Fig.10 Flexural properties of PESV interlayer toughened CF/EP composites with different areal densities

Fig.11 Schematic diagram of the toughening mechanism of PESV interlayer toughened CF/EP composites with different surface densities (a, b) PESV @ 14.2, (b) PESV @ 21.9, (c) PESV @ 31.6 and (d) PESV @ 40.0

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