胺交联的磺化聚芳醚砜酮荷电膜的制备及微观结构

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.

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

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 T_g,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.