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By using a new theoretical glass transition temperature (Tg)–composition equation, Tg’s of statistic binary copolymers obtained from MMA, St and AN were investigated in this article. The copolymers were prepared by bulk copolymerization using azo-bis-isobutyronitrile (AIBN) as initiator. The compositions and Tg’s were determined by NMR and DSC, respectively. The monomer reactivity ratios were obtained...