A new effecient catalyst system(FeCl 3/2PPh 3) for the “living”/controlled radical polymerization of butyl methacrylate by a reverse ATRP process was reported in this paper.With the presence of this catalyst system,the number average molecular weights of the obtained polymer increased in direct proportion with monomer conversion,and the MWDs (molecular weight disctributions) were narrow throughout the reactions(1 17< w/ n<1 22).This reaction system did not include the conventional initiators which were used to generate the primary radicals.
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