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Mohammad Ali Semsarzadeh,Parisa Alamdari 한국고분자학회 2015 Macromolecular Research Vol.23 No.2
Cobalt mediated radical copolymerization of vinyl acetate (VAc) and methyl acrylate (MA) was successfullyperformed in the presence of cobalt(II) acetylacetonate (Co(acac)2), dimethylformamide (DMF) and benzoylperoxide (BPO) as catalyst, cobalt coordinating agent and initiator, respectively, at 45 oC. The individual monomerconversion and comonomer composition of copolymers were determined by 1H NMR spectroscopy. Molecularweight (Mn) and its distribution (Mw/Mn) were analyzed by GPC technique. The time dependence of ln[M]0/[M], thevariation of molecular weight with respect to the conversion, and molecular weight distribution of copolymers werestudied to evaluate controlled characteristics of copolymerization. It was found that Co(acac)2 successfully mediatedthe radical copolymerization of VAc and MA. Moreover, copolymer molecular weight and copolymerization rateincreased with increasing initial MA ratio. The spectroscopy analysis revealed VAc content in the copolymerincreased with conversion regardless of VAc initial ratio, indicating a gradient sequence distribution of the copolymer.