| Synthesis of α-Bromine- Terminated Polystyrene Macroinitiator and Its Initiation of MMA Polymerization by ATRP |
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| 作者姓名： | LIU Feng LIU Bing LUO Ning YING Shengkang LIU Qing |
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| 作者单位： | The Laboratory of Living Polymerization,East China University of Science and Technology, Shanghai 200237, P. R. China,Research Institute of Beijing Yanshan Petrochemical Corporation, Beijing 102550, P. R. China |
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| 基金项目： | 中国科学院资助项目，Research Institute of Beijing Yanshan Petrochemical Corporation，29634010-2，，， |
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| 摘 要： | In the present paper the synthesis of block copolymers via the transformation from living anionic polymerization (LAP) to atom transfer radical polymerization (ATRP) was described. Α-Bromine-terminated polystyrenes(PStBr) in the LAP step was prepared by using n-BuLi as initiator, tetrahydrofuran (THF) as the activator, α-methylstyrene (α-MeSt) as the capping group and liquid bromine (Br2) as the bromating agent. The effects of reaction conditions such as the amounts of α-MeSt, THF, and Br2 as well as molecular weight of polystyrene on the bromating efficiency (BE) and coupling extent (CE) were examined. The present results show that the yield of PStBr obtained was more than 93.8% and the coupling reaction was substantially absent. PStBr was further used as the macroinitiator in the polymerization of methyl-methacrylate(MMA) in the presence of copper(Ⅰ) halogen and 2,2-bipyridine(bpy) complexes. It was found that the molecular weight of the resulted PSt-b-PMMA increased linearly with the increase of the conversion of MMA and the polydispersity was 1.2-1.6. The structures of PStBr and P(St-b-MMA) were characterized by 1H NMR spectra.
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| 关 键 词： | Atom transfer radical polymerization Living anionic polymerization Block copolymer Macroinitiator Bromation α-Methylstyrene Capping reaction |
| 收稿时间： | 1999-03-13 |
Synthesis of α-Bromine-Terminated Polystyrene Macroinitiator and Its Initiation of MMA Polymerization by ATRP |
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| LIU Feng,LIU Bing,LUO Ning,YING Shengkang,LIU Qing.Synthesis of α-Bromine-Terminated Polystyrene Macroinitiator and Its Initiation of MMA Polymerization by ATRP[J].Chemical Research in Chinese University,2000,16(1):72-77. |
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| Authors: | LIU Feng LIU Bing LUO Ning YING Shengkang LIU Qing |
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| Institution: | 1. The Laboratoric of Living Polymerization, East China University of Science and Technology, Shanghai 200237, P. R. China;
2. Research Institute of Beijing Yanshan Petrochemical Corporation, Beijing 102550, P. R. China |
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| Abstract: | In the present paper the synthesis of block copolymers via the transformation from living anionic polymerization (LAP) to atom transfer radical polymerization (ATRP) was described.α-Bromine-terminated polystyrenes(PStBr) in the LAP step was prepared by using n-BuLi as initiator, tetrahydrofuran (THF) as the activator, α-methylstyrene (α-MeSt) as the capping group and liquid bromine (Br2) as the bromating agent.The effects of reaction conditions such as the amounts of α-MeSt, THF, and Br2 as well as molecular weight of polystyrene on the bromating efficiency (BE) and coupling extent (CE) were examined.The present results show that the yield of PStBr obtained was more than 93.8% and the coupling reaction was substantially absent.PStBr was further used as the macroinitiator in the polymerization of methyl-methacrylate (MMA) in the presence of copper (I) halogen and 2, 2' -bipyridine (bpy) complexes.It was found that the molecular weight of the resulted PSt-b-PMMA increased linearly with the increase of the conversion of MMA and the polydispersity was 1.2-1.6.The structures of PStBr and P(St-b-MMA) were characterized by 1H NMR spectra. |
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| Keywords: | Capping reaction |
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