Study On Carbon Fiber Modification And Properties Of Its Composites

With the rapid development of high-performance composite materials, carbon fiber-reinforced polymer composites have been used in many fields. But the carbon fiber surface inert, direct and resin composite easily lead to poor interfacial adhesion, limiting its applications. Therefore, carbon fiber surface was modified to improve the interfacial adhesion properties of their composites in this article.Three surface modification methods, i.e. pyrrole polymerization on surface, plasma treatment and plasma-pyrrole polymerization, were adoped to modify carbon fiber in this paper. The different polymerization temperatures and time of pyrrole polymerization and the different atmosphere at different times of the plasma treatment were studied. The scanning electron microscope (SEM) analysis, atomic force microscopy (AFM) analysis, dynamic mechanical analysis (DMA), infrared spectroscopy (FTIR) analysis, coefficient of thermal expansion test (CTE), photoelectron spectroscopy (XPS) analysis and mechanics of composites were used to make a study on the structure and characters of fiber and composites.The results showed that the roughness of polypyrrole-coated fiber surface increases which helps to improve the interfacial shear strength (IFSS) and the interlaminar shear strength (ILSS). For the plasma treatmet, the surface roughness of the fiber and the active oxygen-containing group increased to some extent, increase the interfacial adhesion between the fiber and matrix, so that the composite mechanical properties and ILSS other materials IFSS increased. For the plasma-pyrrole polymerization, the interfacial properties of composites have been improved obviously compared with polypyrrole-polymerzation modification and plasma treatment. In addiotn, the plasma-pyrrole polymerization modification can effectively controll thermal shock performance degradation.