Abstract:
The surface modification of PBO fiber by methanesulfonic acid (MSA) was studied. The interfacial shearing strength (IFSS) of PBO fiber-epoxy resin was measured by single fiber pull out test. The surface morphology, composition and surface free energy of PBO fiber before and after surface modification were investigated by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and contact angle measurment, respectively. The results showed that, compared with untreated PBO fiber, PBO fibers treated in 60% MSA at 60 ℃ for 6 h had excellent surface properties. The IFSS of treated PBO fiberepoxy resin, the oxygen content, and surface free energy increased by 81%, 13.3% and 17.3%, respectively. With further increase of MSA content, treating time and treating temperature, PBO fiber sheath was destroyed, which led to the decrease of IFSS.