温度对质子交换膜尺寸稳定性的影响

Effect of Temperature on Dimensional Stability of Proton Exchange Membrane

以双酚A型聚砜为基质材料,首先通过Friedel-Crafts反应制备氯乙酰基化聚砜,记为APS,紧接着与羟乙基磺酸钠(HES)反应制备侧链型磺化聚砜(APS-ES)。在用红外光谱和核磁氢谱充分表征的基础上,采用流延成膜法制备相应的质子交换膜(PEM),研究了PEM的吸水率和尺寸稳定性,重点研究了温度对PEM的吸水溶胀性的影响规律。研究结果表明:由于亲水基团远离疏水主链,该PEM能够形成明显的微相分离结构,使得该PEM在高的吸水率下仍能够保持较好的尺寸稳定性,25℃下,该PEM吸水率为24.9%,但是相应的吸水溶胀率仅为11.4%。

Chloroacetylchloride polysulfone (APS)was prepared by Friedel-Crafts reaction with bisphenol A type polysulfone as matrix material,and then a kind of side chain type sulfonated polysulfone(APS-ES)was obtained through the reaction between APS and hydroxyehyl sulfonate sodium.Their chemical structures were confirmed by FT-IR and H-NMR.spectrum.Then the corresponding proton exchange membranes were fabricated by solution casting method,and the water uptaking and size stability of the proton exchange membrane were studied,especially the effect of temperature on swelling property of proton exchange membrane.The experiment results show that the PEM has the micro-phase structure due to the hydrophilic area far away from hydropholic area.The PEMs keep excellent size stability at high wateruptaking,the swelling ratio is only 11.4%when the wateruptaking is 24.9%at 25℃.