Abstract: A novel polyamide-urea-imide composite reverse osmosis (RO) membrane was prepared via two-step interfacial polymerization. 5-Isocyanato-isophthaloyl chloride（ICIC）as a key functional monomer was first reacted with 4-Methyl-m- phenylenediamine (MMPD) to prepare the initial RO membrane by single-step 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) of the initial RO membrane to obtain the new polyamide-urea-imide (MMPD-ICIC-DMMPD) composite RO membrane after heat curing and water rinse. The surface chemical structure of membrane active layer was analyzed by combination of attenuated total reflectance infrared (ATR-IR) and X-ray photoelectronic spectroscopy (XPS), the surface morphology of membrane was observed via scanning electronic microscopy (SEM) and atomic force microscope (AFM)， and the contact angle and chlorine resistance performance of membrane were also measured. The polyamide-urea (MMPD-ICIC) membrane via single-step polymerization was contrasted in all measurements. Result showed that, due to the grafting of a super thin ICIC-DMMPD layer on the initial MMPD-ICIC membrane surface, the MMPD-ICIC-DMMPD membrane via two-step interfacial polymerization had smother surface, slight thicker active separation layer, better hydrophilicity and resistance performance than the MMPD-ICIC membrane via singe-step interfacial polymerization .

Key words: 5-isocyanatoisophthaloyl chloride;N,N′-dimethyl-m-phenylenediamine, polyamideureaimide;two-step interfacial polymerization

摘要： 本论文采用二次界面聚合法制备得到一种新型的聚酰胺-脲-酰亚胺反渗透复合膜。先将关键功能单体5-异氰酸酯-异酞酰氯（ICIC）与4-甲基-间苯二胺（MMPD）经单面界面聚合形成初生态的基膜，之后将关键功能单体N,N’-二甲基间苯二胺（DMMPD）与初生态基膜上残留的ICIC及未反应完的酰氯基团（-COCl）进行二次界面聚合，再经热处理、水漂洗制得一种新型的聚酰胺-脲-酰亚胺（MMPD-ICIC-DMMPD）反渗透复合膜。采用傅立叶衰减全反射红外光谱（ATR-FTIR）和X射线光电子能谱分析了膜活性分离层的化学结构，利用扫描电镜（SEM）和原子力显微镜（AFM）观察了所成膜的表面形态，同时测试了膜的耐氯性能，并以单次聚合聚酰胺-脲（MMPD-ICIC）膜作对比。结果表明：采用二次界面聚合法在功能化基膜MMPD-ICIC上引入一超薄ICIC-DMMPD层，使得所成二次聚合膜MMPD-ICIC-DMMPD的活性分离层相对稍厚，表面更光滑，且亲水性和耐氯性能更好。

关键词: 5-异氰酸酯-异酞酰氯；N,N&prime, -二甲基间苯二胺；聚酰亚胺-脲-酰亚胺；二次界面聚合