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《JOURNAL OF BEIJING UNIVERSITY OF CHEMICAL TECHNOLOGY》 1998-02
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Atom transfer radical polymerization of styrene and synthesis of its block copolymer

(College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029)  
The atom transfer radical polymerization of styrene(St) and methyl methacrylate(MMA) initiated by methyl chloroacetate (MCA), chloroacetonitrile(CAN), benzyl chloride(BC) and methyl trichloroacetate(MTCA) in the presence of CuCl(Ⅰ)/2,2′ bipyridine complex was investigated. When CAN and MTCA were used as initiators, the polymerization rate was fast, the initiating efficiency was high and the molecular weight distribution (MWD) was narrow. While MAC and BC were used as initiators, the polymerization rate was slower, the initiating efficiency was lower and the MWD was broader. Additionally, sequential atom transfer radical living polymerization of alkyl (meth)acrylate from PS with CAN as initiator afforded AB type block copolymers. The MWD of poly(styrene b alkyl acrylate) was narrow(same as PSt), but the MWD of poly(St b MMA) copolymer was very broad and had two peaks. The above results were interpreted according to the difference of C—Cl bond dissociation energy between initiator and polymer.
【CateGory Index】: TQ316.344,TQ316.32
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