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A type of polycyclotriphosphazene derivative (PCTPD), hexasulfanilic acid polycyclotriphosphazene (HSACP) and HSACP grafting SPEEK, sulfonated poly(2-(petachloropolycyclotriphosphazene-oxy)) etheretherketone (SPPSACPEEK) were syn- thesized, which were characterized by FTIR and 31 P NMR. Then three types of composite membranes such as HSACP grafting SPEEK, HSACP blending SPEEK, and nano Y2O3 doping and HSACP grafting SPEEK, respectively, were continuously pre- pared by solution-casting method. Comparing to SPEEK membranes with different amount of HSACP grafted or blended, grafting 15 wt% HSACP and doping 10 wt% nano Y2O3 SPEEK membrane conducted outstanding overall behavior of proton conductivity reaching 3.18 × 10 2 S/cm at 90 o C which was merely junior to SPEEK with 15 wt% HSACP grafted, methanol permeability coefficient getting 9.46 × 10 8 cm 2 ·s 1 , swelling degree of 20.9% and solid residue of 98.98% which was superior to all

Polycyclotriphosphazene Derivative Grafted and NanometerY2O3Doped SPEEK Composite Membrane for DMFC