新型共混交联磺化聚醚醚酮/部分氟化磺化聚芳醚砜质子交换膜的制备与表征

Preparation and Characterizations of Cross-linked Sulfonated Poly(ether ether ketone)/Partially Fluorinated Sulfonated Poly(aryl ether sulfone) Blend Membranes

制备了基于磺化聚醚醚酮(SPEEK)/部分氟化磺化聚芳醚砜(SPFAES)的共混交联型质子交换膜(CMB),研究了其吸水率、尺寸变化、力学性能、热性能、质子电导率、化学稳定性及电池性能等.通过在溶液浇铸过程中加入脱水剂诱导高温脱水反应,在共混体系内构建了交联结构.结果表明,由于SPEEK与SPFAES之间良好的相容性、分散性和聚合物链的重排及交联作用,CMB膜在干态下均表现出出色的力学强度,且物化稳定性得到大幅提升.在低离子交换容量(1.21-1.51 mmol/g)条件下,CMB膜的质子电导率达到122-219 mS/cm(80℃),在氢氧单电池中,CMB4膜的最大功率密度达到530.5 mW/cm^(2)(80℃).

A type of blend and cross-linked proton exchange membrane(CMB)based on sulfonated poly(ether ether ketone)(SPEEK)/partially fluorinated sulfonated poly(aryl ether sulfone)(SPFAES)were prepared,and the properties including water uptake,swelling ratio,mechanical properties,thermal properties,proton conductivity,chemical stability and fuel cell performances of the CMBs were evaluated.The crosslinking structure was constructed in the blend system by adding dehydrating agent during solution casting.The results indicate that the CMB membranes all exhibit excellent mechanical strength in dry state and greatly improved physicochemcial stability due to the good compatibility and dispersion between SPEEK and SPFAES,and the rearrangement and cross-linking of polymer chains.With low ion exchange capacity(1.21—1.51 mmol/g),the proton conductivities of CMB membranes reach 122—219 mS/cm(80℃), and the maximum power density of the CMB4 membrane achieves 530.5 mW/cm^(2)(80℃) in a single hydrogen-oxygen fuel cell.