Polymerization Mechanism of Methyl Methacrylate Initiated by Ethyl Acetate/t-BuP_4  

作　　者：De-Yong Xia Qi-Min Jiang Wen-Yan Huang Hong-Jun Yang Xiao-Qiang Xue Li Jiang Bi-Biao Jiang 

机构地区：[1]Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University [2]Changzhou University Huaide College

出　　处：《Chinese Journal of Polymer Science》2019年第6期598-603,共6页高分子科学（英文版）

基　　金：finanically supported by the National Natural Science Foundation of China (No. 21474010);the Priority Academic Program Development of Jiangsu Province

摘　　要：The anionic polymerization of methyl methacrylate(MMA) was carried out using phosphazene base t-BuP_4 and ethyl acetate(EA) as the catalyst and the initiator, respectively. Gas chromatography(GC), size exclusion chromatography(SEC) measurements, and nuclear magnetic resonance(NMR) analyses were used to reveal the polymerization mechanism and to confirm the polymer structure. The results confirmed the proposed polymerization mechanism and the polymer structure, while the initiator efficiency was low. Meanwhile,the initiation by methoxy anion coming from hydrolysis of the ester bond in MMA was also observed. As a result, there is a marked deviation between the theoretical molecular weight and the measured molecular weight, and it is essential to carry out the polymerization at excessive dosage of t-BuP_4 for preparing polymers with narrow molecular weight distribution.The anionic polymerization of methyl methacrylate(MMA) was carried out using phosphazene base t-BuP_4 and ethyl acetate(EA) as the catalyst and the initiator, respectively. Gas chromatography(GC), size exclusion chromatography(SEC) measurements, and nuclear magnetic resonance(NMR) analyses were used to reveal the polymerization mechanism and to confirm the polymer structure. The results confirmed the proposed polymerization mechanism and the polymer structure, while the initiator efficiency was low. Meanwhile,the initiation by methoxy anion coming from hydrolysis of the ester bond in MMA was also observed. As a result, there is a marked deviation between the theoretical molecular weight and the measured molecular weight, and it is essential to carry out the polymerization at excessive dosage of t-BuP_4 for preparing polymers with narrow molecular weight distribution.

关 键 词：Phosphazene base(t-BuP4) Methyl methacrylate Ethyl acetate Anionic polymerization 

分 类 号：O6[理学—化学]