Modified silicon carbide whisker reinforced polybenzimidazole used for high temperature proton exchange membrane

摘要

cqvip:Polybenzimidazole containing ether bond(OPBI) was reinforced with silicon carbide whisker(m Si C) modified by 3-aminopropyltriethoxysilane(KH550), and then doped with phosphoric acid(PA) to obtain OPBI/m Si C/PA membranes. These OPBI/m Si C/PA membranes have excellent mechanical strength and oxidative stability and can be used for high temperature proton exchange membrane(HT-PEM). The tensile strength of OPBI/m Si C/PA membranes ranges from 27.3 to 36.8 MPa, and it increases at first and then decreases with the increase of m Si C content. The high m Si C content and PA doping level contribute to improving the proton conductivity of membranes. The proton conductivity of PBI/m Si C-10/PA membrane is 27.1 m S cm-1 at 170 °C without humidity, with an increase of 55.7% compared with that of OPBI/PA membrane. These excellent properties make OPBI/m Si C/PA membranes promising membrane materials for HT-PEM applications.