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利用溶液浇铸法制备了一系列双磺化型磺化聚芳醚砜/磺化聚酰亚胺(SPAES/SPI)复合质子交换膜.扫描电子显微镜(SEM)结果显示复合膜不存在明显的相分离,表明二者具有很好的相容性.由于SPI的引入,复合膜在甲醇中稳定性较纯SPAES具有大幅的提高,比Nafion112低得多的甲醇吸收率表明了这些复合膜具有比后者更低的甲醇透过率.复合膜显示了与单组分膜相类似的高温分解稳定性,磺酸基团的分解温度达到了290℃以上.复合膜显示出远高于纯SPAES膜的尺寸稳定性能,在130℃高温中200h处理后,所有的复合膜均保持了高的机械性能,而此时纯SPAES膜已经溶解于水中.而且由于两种磺化聚合物间的复合,复合膜维持了较高的IEC水平,显示了较高的质子导电率,在80%相对湿度时的质子导电率与Nafion112相近,而在水中的质子导电率均高于Nafion112.
A series of bis-sulfonated poly (arylene ether sulfone) / sulfonated polyimide (SPAES / SPI) composite proton exchange membranes were prepared by solution casting method.The results of scanning electron microscopy (SEM) showed that there was no obvious phase Separation, indicating that the two have good compatibility.Since the introduction of SPI, the stability of the composite membrane in methanol than pure SPAES has a substantial increase, much lower than Nafion112 methanol absorption rate shows that the composite membrane has a ratio With a lower methanol permeability.The composite membrane showed pyrolysis stability similar to that of the one-component membrane, with the decomposition temperature of the sulfonic acid group reaching over 290 ° C. The composite membrane showed much higher thermal conductivity than the pure SPAES membrane Dimensional stability, all the composite films maintained high mechanical properties after 200 h treatment at high temperature of 130 ° C, while the pure SPAES film was dissolved in water at the same time as the composite between the two sulfonated polymers, Maintained a higher IEC level, showing a higher proton conductivity, proton conductivity at 80% relative humidity Nafion112 similar to proton conductivity in water were higher than Nafion112.