新型聚（酰胺-脲-酰亚胺）反渗透复合膜的稳定性

摘要

A novel poly( amide-urea-imide) composite reverse osmosis membrane was fabricated via two-step interfacial polymerization. First, 5-isocyanato-isophthaloyl chloride( ICIC) as a key functional monomer reac-ted with m-phenylenediamine( MPD) to prepare the initial substrate MPD-ICIC membrane by single interfacial polymerization technology. Then, the other key functional monomer N,N'-dimethyl-m-phenylenediamine (DMMPD) was polymerized with the remaining ICIC and acyl chlorine group(—COCl) or isocyanato group (—N C O) of the substrate membrane to obtain the new poly( amide-urea-imide) composite reverse os-mosis membrane( MPD-ICIC@ICIC-DMMPD) after heat-curing and water rinse. The surface chemical struc-ture of membrane active layer was analyzed by combination of attenuated total reflectance infrared and X-ray photoelectronic spectroscopy, and the separation performance of membrane was also measured. Then, the sta-bility of the obtained membrane MPD-ICIC@ICIC-DMMPD was further analyzed microscopically by molecular dynamic simulation method.%通过二次界面聚合法制备了一种新型的聚(酰胺-脲-酰亚胺)反渗透复合膜。将常规二元胺———间苯二胺( MPD)与关键功能单体5-异氰酸酯基-异肽酰氯( ICIC)通过界面聚合得到MPD-ICIC初生态基膜,再与关键功能单体N,N'-二甲基间苯二胺( DMMPD)经二次界面聚合制得聚(酰胺-脲-酰亚胺)反渗透复合膜。采用傅里叶变换红外光谱和X射线光电子能谱分析膜活性层的化学结构,评价膜的分离性能,在此基础上采用分子动力学模拟方法从微观角度分析二次聚合膜的稳定性。