Organostibine mediated controlled/living random copolymerization of styrene and methyl methacrylate |
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Authors: | Qiang Zhang Jun Li ZhengPing Liu Yi Ni |
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Institution: | 1. BNU Key Lab of Environmentally Friendly and Functional Polymer Materials; Institute of Polymer Chemistry and Physics, College of Chemistry, Beijing Normal University, Beijing, 100875, China
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Abstract: | The first example of organostibine mediated controlled/living random copolymerization of styrene (St) and methyl methacrylate (MMA) was achieved by heating a solution of St/MMA/organostibine mediator at 100 °C or St/MMA/organostibine mediator/AIBN with various monomer feed ratios at 60 °C. The addition of AIBN significantly decreased the reaction temperature and enhanced the rate of copolymerization. The structure of poly(St-co-MMA) was verified by 1H NMR. The reactivity ratios at 60 °C were determined by the extended Kelen-Tüd?s method to be γSt = 0.40 and γMMA = 0.44. The ln(M]0/M]) increased linearly with increasing reaction time. The number-average molecular weights of poly(St-co-MMA) increased linearly with conversion. Poly(St-co-MMA) with expected number-average molecular weight and low polydispersity index was formed. The living characteristic was further confirmed by chain-extension of poly(St-co-MMA) to form poly(St-co-MMA)-b-PMMA. |
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