Preparation, characterization and enhanced performance of functional crosslinked membranes using poly(vinyl alcohol) as macromolecular crosslinker for fuel cells
writer：Jingmei Xu
keywords：macromolecular crosslinker，fuel cells
source：期刊
Issue time：2016年
Functional cross-linked membranes based on sulfonated poly(arylene ether ketone sulfone) containing pendant carboxyl groups (C-SPAEKS) and poly(vinyl alcohol) (PVA) as macromolecular crosslinker were fabricated. The covalent cross-linking reaction was realized by thermal treatment between carboxyl and hydroxyl groups. The cross-linked membranes exhibited favorable thermal stability, good mechanical property, positive dimensional stability and desirable single cell performance. Moreover, the cross-linked membranes show low methanol permeability coefficients ranged from 4.01 x 10(-7) cm -2 s(-1) to 8.71 x 10(-7) cm(-2) s(-1) with the PVA weight ratio decreased from 50% to 10%, which were much lower than that of C-SPAEKS membrane (15.97 x 10(-7) cm(-2) s(-1)). The proton conductivities of all the cross-linked membranes were above 10(-2) S cm(-1) at 25 degrees C. Moreover, the cross-linked membranes exhibited higher relative selectivity than that of composite membranes, which indicated that this series of cross-linked membranes had potential application value and were expected to be used in fuel