Thermal Oxidation-Polymeric Coating Treatments of High Modulus Graphite Fibers.

摘要

The interfacial bond between polyvinyl alcohol (PVA) and water-sized high modulus graphite fibers and an epoxy matrix was improved by thermal oxidation of the fiber surface by a propane-generated flame followed by application of various types of thermoplastic coatings and subsequent impregnation with the epoxy resin solution. This approach was followed in an attempt to obtain a 'ductile' fiber-matrix interface. The mechanical property results indicated that improvement in composite interlaminar shear strength was attained without apparent loss of fiber strength (compared to composites fabricated with the same types of yarn, but untreated). Also, scanning electron microscopy was utilized to obtain photomicrographs of treated fibers and fractured composites. (Author)