ELECTROGRAFTING OF POLY(MALEIC ACID-CO-ITACONIC ACID) ONTO GRAPHITE FIBERS FOR THE IMPROVEMENT OF INTERFACIAL PROPERTIES

摘要

Graphite fibers were electrografted with poly(maleic acid-co-itaconic acid) simultaneous with anodic oxidation in an attempt to improve the interfacial properties between graphite fibers and polymer matrix. Fourier transform infrared spectrometer (FT1R) indicates that electropolymerization brought more carboxylic groups onto the surface of graphite fibers, which could form free radical sites. Then the mode of reaction was inferred. Scanning electron microscope (SEM) images indicate that polymeric nuclei were formed first and then grew into a continuous coating. The thickness of the coating grew with the increasing charge density. The achievement of the polymer layer was proved by Raman spectroscopy mapping the stress of the fiber inside an epoxy resin droplet. The results show that interface shear strength(IFSS) has a greatly increase from 65 to 174 MPa.