Abstract
The transformations of free radical promoted cationic polymerization to atom transfer radical poly- merization (ATRP) to form the block copolymers of cyclohexene oxide (CHO) with styrene (St) were performed. In the first step, bromine terminated poly(CHO)s (PCHO-Br) were prepared by free radical promoted cationic polymerization of CHO monomer in the presence of 2-oxo-1,2-diphenylethyl-2-bromopropanoate, shortly bromo benzoin, (B-Br) and an onium salt namely 1-ethoxy-2-methylpyridinium hexafluorophosphate (EMP þ SbF6 � ) as the initiating system. The bromine functionalized polymers thus prepared were used as initiators in ATRP of St, in bulk, in conjunction with CuBr/2,2 0 -bipyridine as catalyst gave well-defined block copolymer of CHO and St. Block copolymer formations were evidenced by 1 H NMR and gel permeation chromatography (GPC) measurements. (DOI 10.1295/polymj.37.700)
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