基体亲水ePTFE的复合质子交换膜

Composite proton exchange membranes based on hydrophilic ePTFE matrix

采用萘-钠法对ePTFE膜进行亲水处理,研究了萘钠自由基溶液处理ePTFE的机理及对ePTFE的亲疏水性的处理效果,探讨了ePTFE的亲疏水性对复合膜制备的影响。结果表明,萘钠自由基亲水化处理的实质是生成了—OH、—CO和—CH等基团。处理后的ePTFE的接触角由(137±0.5)°变为(45±0.5)°,全氟磺酸树脂(PFSI)与ePTFE基体的结合能力增大,提高了PFSI的填充度,电池性能有所提高。

Hydrophilic ePTFE matrix was prepared by using sodium-naphthalene treatment. The reaction mechanism between sodium-naphthalene and PTFE, the properties of the as-resulting hydrophilic membrane and the comparison of PEM based on hydrophilic ePTFE matrix vs. hydrophobic ePTFE matrix were investigated. The results showed that the essence of sodiumnaphthalene hydrophilic treatment was the generation of --OH,--CO and --CH groups. The contact angle of the as-received ePTFE changed from （137± 0.5）° to （45 ± 0.5）°, the binding capacity of PFSI and ePTFE substance increased, the filling degree of PFSI enhanced, the performance of the cell improved.