4-二甲氨基吡啶催化的界面聚合法制备超支化聚乙烯亚胺复合膜  

Preparation of Hyperbranched Polyethyleneimine Composite Membrane Using Interfacial Polymerization Catalyzed by 4-Dimethylamiopryidine

作　　者：张林[1] 林赛赛[1] 魏平[1] 程丽华[2] 陈欢林[1] 

机构地区：[1]浙江大学化学与生物工程学系,教育部膜与水处理技术工程中心,浙江杭州310027 [2]浙江大学环境工程系,浙江杭州310058

出　　处：《催化学报》2012年第10期1730-1735,共6页

基　　金：国家自然科学基金(21076176);国家重点基础研究发展计划(973计划;2009CB623402);水体污染控制与治理科技重大专项经费资助(2009ZX07424-001);浙江省重点科技创新团队项目(2009R50045)~~

摘　　要：为了提高超支化聚合物在界面聚合反应中的成膜性能,选择4-二甲氨基吡啶(DMAP)作为空间位阻催化剂,用于催化超支化聚乙烯亚胺(PEI)与均苯三甲酰氯(TMC)界面聚合成膜.研究了DMAP在水油两相中的溶解性能,发现DMAP的适宜用量为底物PEI的8%.傅里叶红外光谱和扫描电镜表征结果表明,DMAP能够催化PEI上更多氨基参与酰化交联,在聚砜底膜上形成光滑连续的网络状结构.该复合分离膜对NaCl的截留率由无DMAP催化成膜的45.2%提高至85.4%,水通量高达60.8L/(m2.h).结合吡啶环上1-叔胺基团及环外的4-二甲氨基团,推测了DMAP在PEI界面聚合反应过程中消除强空间位阻效应的催化机理.The promoting effect of 4-dimethylaminopyridine（DMAP） on the interfacial polymerization between trimesoyl chloride（TMC） and hyperbranched polyethyleneimine（PEI） was investigated.The solubility of DMAP in organic phase and aqueous phase was examined and the mass fraction of DMAP to PEI was optimized to 8%.Fourier transform infrared spectroscopy and scanning electron microscopy results showed that when catalyzed by DMAP,almost all the amino groups of PEI were cross-linked with TMC into amide groups,and thus a smooth and integrated layer was formed on the polysulfone support membrane.The rejection of PEI/TMC composite membrane against NaCl was improved to 85.4% as compared with 45.2%.Combined with the donating electron effects of 1-tertiary amine and 4-methylamino groups,the catalytic mechanism for DMAP in this PEI-based interfacial polymerization was proposed.

关 键 词：4-二甲氨基吡啶 超支化聚乙烯亚胺 界面聚合 空间位阻 复合膜 

分 类 号：TB383.2[一般工业技术—材料科学与工程]