Preparation and Characterization of LCT/SPEEK Composite Membrane for PEMFC Application

摘要

A novel SPEEK-based blends proton exchange membrane doping liquid crystal polymer intercalated montmorillonite(LCT)were prepared by solution casting technology.FT-IR,XRD and POM proved that SPEEK contained sulfonic acid group and LCT which had liquid crystal intercalated into SPEEK matrix.LCT/SPEEK composite membrane with 1.0 wt% had higher swelling rate and proton conductivity than those membranes.It was also shown that the proton conductivity of LCT/SPEEK composite membrane decreased,but reached 0.137 S/cm when LCT was 1.0 wt%,and the swelling rate of SPEEK membrane was significantly decreased 6.19% to 3.38%.The layer silicate structure in LCT promotes its dimensional stability,and the sulfonic group forms hydrogen bond network in SPEEK matrix to promote proton transfer.These results propose the composite membranes as a potential candidate for PEMFC at 25 ℃ making SPEEK composite membrane.