a Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, China
Polym. Chem. 2013, 4, 2876-2883.
The concept of thermoregulated phase-transfer catalysis (TRPTC) for an aqueous–organic biphasic system was applied in Cu(II)-mediated atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA). Herein, activators generated by electron transfer (AGET) ATRP was used to establish the TRPTC ATRP system using 2-cyanoprop-2-yl 1-dithionaphthalate (CPDN) as an alkyl pseudohalide initiator, CuBr2 as the catalyst and ascorbic acid (AsAc) as the reducing agent. It used a thermo-responsive monofunctional ligand including the dipyridyl group (MPEG-DPA), which enabled the transfer of the catalyst complex into the organic phase from the aqueous phase upon heating, thus achieving homogeneous polymerization; and the catalyst complex could retransfer into the aqueous phase from the organic phase thereby realizing the separation and recycling of the catalyst complex upon cooling. Well-defined PMMA with controlled molecular weight and narrow molecular weight distribution could be obtained by TRPTC ATRP. Furthermore, the polymerization of MMA could be successfully carried out even when the amount of catalyst was reduced to the ppm level. The features of controlled/“living” radical polymerization of MMA were verified by chain end analysis and chain-extension experiments.
链接： //pubs.rsc.org/en/content/articlelanding/2013/PY/C3PY00111C#!divAbstract
