摘要
Transition metal-mediated atom transfer radical polymerization （ATRP） is a ＂living＂Jcontrolled radical polymerization. Recently, there has been widely increasing interest in reducing the high costs of catalyst separation and post-polymerization purification in ATRP. In this work, trolamine was found to significantly enhance the catalytical performance of CuBr]N,N,N＇,N＇-tetrakis（2-pyridylmethyl） ethyle- nediamine （CuBr/TPEN） and CuBr/tris[2-（dimethylamino） ethylamine] （CuBr/MesTREN）. With the addition of 25-fold molar amount of trolamine relative to CuBr, the catalyst loadings of CuBr/TPEN and CuBr/Me6TREN were dramatically reduced from a catalyst-to-initiator ratio of 1 to 0.01 and 0.05, respectively. The polymerizations of methyl acrylate, methyl methacrylate and styrene still showed first-order kinetics in the presence of trolamine and produced poly（methyl acrylate）, poly（methyl methacrylate） and polystyrene with molecular weights close to theoretical values and low polydispersities. These results indicate that trolamine is a highly effective and versatile promoter for ATRP and is promising for potential industrial application.
Transition metal-mediated atom transfer radical polymerization （ATRP） is a ＂living＂Jcontrolled radical polymerization. Recently, there has been widely increasing interest in reducing the high costs of catalyst separation and post-polymerization purification in ATRP. In this work, trolamine was found to significantly enhance the catalytical performance of CuBr]N,N,N＇,N＇-tetrakis（2-pyridylmethyl） ethyle- nediamine （CuBr/TPEN） and CuBr/tris[2-（dimethylamino） ethylamine] （CuBr/MesTREN）. With the addition of 25-fold molar amount of trolamine relative to CuBr, the catalyst loadings of CuBr/TPEN and CuBr/Me6TREN were dramatically reduced from a catalyst-to-initiator ratio of 1 to 0.01 and 0.05, respectively. The polymerizations of methyl acrylate, methyl methacrylate and styrene still showed first-order kinetics in the presence of trolamine and produced poly（methyl acrylate）, poly（methyl methacrylate） and polystyrene with molecular weights close to theoretical values and low polydispersities. These results indicate that trolamine is a highly effective and versatile promoter for ATRP and is promising for potential industrial application.
基金
supported by National Natural Science Foundation of China (No.21174133)
Zhejiang Science Foundation for Distinguished Young Scholars (No.LR12B04002)
