EFFECT OF CARBON FIBER SURFACE TREATMENT ON INTERFACIAL BONDING PERFORMANCE OF CARBON FIBER REINFORCED POLYPROPYLENE COMPOSITES

Abstract

Abstract: Interfacial modification acts as an important link to promote the development of thermoplastic carbon fiber reinforced composites. In this article, the effects of electrochemical oxidation and epoxy sizing on the interfacial bonding performance of carbon fiber/polypropylene composites (CF/PP) were studied. The surface morphology and chemical properties of a series of carbon fibers were first characterized by AFM, XPS, etc. and then the interfacial shear strength (IFSS) of these CF/PP were tested by microdroplet debonding experiments. The results show that high temperature carbonization make carbon fiber surface inert, and the IFSS of composites is only 3.76 MPa. The IFSS increased to 4.85 MPa after electrochemical oxidation as the roughness and the number of hydroxyl and carboxyl groups on the surface increased. The IFSS was further enhanced to 5.51 MPa after epoxy sizing with the introduction of a large number of active epoxy groups to the surface, which also exhibited higher interfacial uniformity. It is believed that it is the increase of mechanical interlocking, van der Waals force, and intermolecular entanglement caused by changes in the surface properties that are the dominant reasons for the improvement of CF/PP interfacial bonding performance. Compared with compatibilizer, traditional surface treatment of carbon fiber exerted a weak improvement on the CF/PP interfacial performance. Therefore, there is still great potential for improving the CF/PP interfacial bonding performance through developing more effective surface modification methods combined with compatibilizer.

Key words: carbon fiber, polypropylene, interface, microdroplet debonding, composites

CLC Number:

TB332

XU Sheng, HUANG Xue-fei, YANG Bin. EFFECT OF CARBON FIBER SURFACE TREATMENT ON INTERFACIAL BONDING PERFORMANCE OF CARBON FIBER REINFORCED POLYPROPYLENE COMPOSITES[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(1): 65-71.

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