胺交联的磺化聚芳醚砜酮荷电膜的制备及微观结构

Microstructure of the cross-linked sulfonated poly(phthalazinone ether sulfone ketone)(SPPESK) charged membranes via sulfonamide linkages

采用乙二胺(EDA),己二胺(HDA)和对苯二胺(PPD)为交联剂,与磺化杂萘联苯聚芳醚砜酮(SPPESK)反应生成磺酰胺交联键,制备胺交联的磺化杂萘联苯聚芳醚砜酮荷电膜。通过元素分析确定交联程度。采用示差扫描量热,扫描电镜以及应力-应变测试等方法研究交联膜的微观结构。实验结果表明,交联剂的种类、用量以及SPPESK的初始磺化度显著影响体系的相容性,交联剂用量过高会导致交联膜发生微观相分离,影响交联膜的性能。胺交联法制备荷电膜时交联度不宜过高。

Cross-linked sulfonated poly（phthalazinone ether sulfone ketone） （SPPESK） charged membranes are prepared through first condensation of sulfonic acid groups with ethylenediamine （EDA）, hexylenediamine （HDA） and 1,4-diaminobenzene （PPD） to form sulfonamide linkages, then accomplishment with solution casting. Degree of cross-linking is determined by elemental analysis. Microstructure of the cross-linked membranes are studied by the measurements of differential scanning calorimentry （DSC）, scanning electron microscopy （SEM） and tensile-strain test. The cross-linked membrane appears one or two Tg, depending on cross-linker content and cross-linker species. With increased cross-linker content, surface of the cross-linked membrane is gradually changed to loose structure. Tensile strength of the cross-linked membrane reaches a maximum value with the increase of the cross-linker content then goes down. The results of this study indicate that cross-linking can influence greatly the compatibility of the cross-linked membrane. High cross-linker content might cause micro-phase separation in the cross-linked membrane, which would have further influence on the properties of the membranes. Therefore, lightly cross-linking would be sound on the view of application.