二次界面聚合法制备聚酰胺-脲-酰亚胺反渗透复合膜

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。

Novel polyamide-urea-imide composite reverse osmosis membrane prepared via two-step interfacial polymerization

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 first reacted with 4-methyl-m-phenylenediamine(MMPD)to prepare the initial RO membrane by the 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 a 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.The 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 smoother surface,slight thicker active separation layer,better hydrophilicity and resistance performance than the MMPD-ICIC membrane via singe-step interfacial polymerization.