Controlled Radical Homopolymerization and Block Copolymerization of Methyl Methacrylate Based on RAFT Process

Abstract

Abstract: Methyl methacrylate(MMA) was polymerized by the controlled radical polymerization based on reversible addition-fragmentation chain transfer(RAFT) process. The effects of initiator and dithioester concentrations on polymerization rate and polydispersity of the resulted polymers were investigated. A larger initiator concentration increases the polymerization rate but has little influence on the molecular weight which is mainly determined by the concentration of dithoiester. PMMA-block-polystyrene(PMMA-b-PS) and PMMA-block-poly(styrene-co-4-chloromethylstyrene) were synthesized by means of macroinitiator technique, with the latter being spin-labeled by polymer reaction with 4-hydroxy-2,2,6,6-tetramethylpiperidinyl^-1-oxy.

Key words: Controlled free radical polymerization, Reverse addition-fragment chain transfer(RAFT) system, Kinetics, Block copolymer, Spin label

CLC Number:

O631

TrendMD:

PAN Jing-Yun, HE Jun-Po, JIANG Hong-Jin, LIU Yang, YANG Yu-Liang. Controlled Radical Homopolymerization and Block Copolymerization of Methyl Methacrylate Based on RAFT Process[J]. Chem. J. Chinese Universities, 2004, 25(9): 1759.

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Controlled Radical Homopolymerization and Block Copolymerization of Methyl Methacrylate Based on RAFT Process

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