Magnetic Nanoparticle Supported Catalyst for Atom Transfer Radical Polymerization
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- 作者：Shijie Ding ; Yangchuan Xing ; Maciej Radosz ; Youqing Shen
- 刊名：Macromolecules
- 出版年：2006
- 出版时间：September 19, 2006
- 年：2006
- 卷：39
- 期：19
- 页码：6399 - 6405
- 全文大小：592K
- 年卷期：v.39,no.19(September 19, 2006)
- ISSN：1520-5835
文摘
Magnetic nanoparticles were used to support an ATRP catalyst for the polymerization of methylmethacrylate (MMA) for minimized adverse effect of catalyst support and easy catalyst separation. The nanoparticle-supported catalyst mediated a living/controlled radical polymerization of MMA as effectively as unsupportedcatalysts. With the addition of 22 mol % of CuBr2, the polymer molecular weights were well-controlled with aninitiator efficiency of 0.85 and polydispersity lower than 1.2. The supported catalysts could be easily separated/isolated using an external magnetic field and reused with slightly decreased activity but further improved control.The activity of the recycled catalyst was regenerated by copper metal or in-situ regeneration using reducingagents such as alkylamine or tin(II) compounds. Block copolymerization using PEG macroinitiator and chainextension were conducted to confirm the livingness. Block copolymers with controlled molecular weights andlow polydispersity were obtained using the fresh or reused supported catalysts. It was concluded that nanosizedsupports had reduced adverse effects on catalysis.