Study on the preparation and properties of synergistic reinforcement system of carbon fiber and polyamide self-reinforced composite

doi:10.19936/j.cnki.2096-8000.20211028.031

Abstract

Abstract: A synergistically reinforced composite system (CF-PF/coPA) from unidirectional carbon fibers and self-reinforced polyamide composites was prepared by film stacking and hot pressing process. This self-reinforced polyamide composites with excellent interfacial properties and toughness were introduced into carbon fiber reinforced polyamide composites (CF/coPA). Longitudinal/transversal mechanical properties, flexual properties and thermo-mechanical properties were studied by 0° and 90° tensile tests, three-point bending tests and dynamic mechanical tests of these unidirectional CF-PF/coPA composites with different fiber volume fractions. Compared with PF20/coPA composites, longitudinal tensile strength (267.6 MPa) and modulus (8.9 GPa) of CF-PF (10∶10)/coPA composites have improved by 38.6% and 778.7%, respectively. Moreover, flexual strength (68.04 MPa) improved by 78.2% and 18.8% respectively compared with PF/coPA and CF/coPA composites. Meanwhile, the fiber reinforcing efficiency has been improved by 18.3% compared with CF20/coPA composites. SEM images of fractured surfaces, 90° tensile and three-point bending tests show that CF-PF/coPA composites exhibit superior interfacial properties. Dynamic mechanical tests show that the composites have higher mechanical properties than PF20/coPA and CF20/coPA composites at both low and high temperatures. Therefore, this synergistically reinforced composite system shows potential advantages on properties and cost issues, suggesting its theoretical and practical significance in lightweight applications of structural materials.

Key words: carbon fiber reinforced polymeric composites, self-reinforced composites, synergistic reinforcement, mechanical properties, lightweight

CLC Number:

TB332

MEN Shu-lin, ZHANG Jian-min, GAO Zhi-hao, WEN Rong-yan, LUO Lin, CUI Xiao-chen. Study on the preparation and properties of synergistic reinforcement system of carbon fiber and polyamide self-reinforced composite[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(6): 41-46.

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