聚合物固载化聚乙二醇季铵盐型相转移催化剂的结构与催化活性  

Structure and Catalytic Activity of Polymer-Supported Polyethylene Glycol and Onium Phase Transfer Catalyst

作　　者：李顺子[1] 冯鸣华[1] 梁逊[1] 

机构地区：[1]南开大学化学系,天津300071

出　　处：《催化学报》2001年第1期71-73,共3页

摘　　要：The gelatinous and macroporous phase transfer catalysts with multiple active centers were synthesized by means of quarterisation of PEG tertiary amine and chloromethylated St DVB copolymer. They were examined as phase transfer catalysts in the reaction of n C 8H 17 Br with solid NaI. The experimental results showed that the reaction rate was first order with respect to the concentration of n C 8H 17 Br. The effects of catalyst structure on the catalytic activity were also investigated. The observed reaction rate constant ( k obsd ) increased as the degree of cross linking of polymer decreased. Macroporous catalysts showed a higher activity (2～2 5 times) than that of microporous catalysts with the same degree of cross linking of polymer, particle size and amount of supported PEG. Molecular weight of PEG also showed much influence on k obsd . As molecular weight of PEG rose properly, the catalysts showed a higher activity. The results were discussed from the aspect of triphase catalysis reaction mechanism.The gelatinous and macroporous phase-transfer catalysts with multiple active centers were synthesized by means of quarterisation. of PEG tertiary amine and chloromethylated St-DVB copolymer. They were examined as phase-transfer catalysts in the reaction of n-C8H17Br with solid NaI The experimental results showed that the reaction rate was first-order with respect to the concentration of n-C8H17Br. The effects of catalyst structure on the catalytic activity were also investigated. The observed reaction rate constant (k(obsd)) increased as the degree of cross-linking of polymer decreased. Macroporous catalysts showed a higher activity (2 similar to2.5 times) than that of microporous catalysts with the same degree of cross-linking of polymer, particle size and amount of supported PEG. Molecular weight of PEG also showed much influence on k(obsd). As molecular weight of PEG rose properly, the catalysts showed a higher activity. The results were discussed from the aspect of triphase catalysis reaction mechanism.

关 键 词：苯乙烯-二乙烯苯共聚物 固载化 聚乙二醇 季铵盐 相转移催化剂 溴辛烷 碘代反应 结构 催化活性 

分 类 号：O643[理学—物理化学]