COORDINATION COPOLYMERIZATION OF STYRENE WITH MALEIC ANHYDRIDE BY RARE-EARTH COORDINATION CATALYSTS  

作　　者：杨慕杰 郑豪 沈之荃 

机构地区：[1]Department of Chemistry, Zhejiang University, Hangzhou 310027, PRC

出　　处：《Science China Chemistry》1992年第6期641-648,共8页中国科学（化学英文版）

摘　　要：The study on coordination copolymerization of styrene (S) with maleic anhydride (MA) by rare-earth coordination catalysts, NdL_3-Al(i-Bu)_3, has been successfully carried out for the first time. Some features, kinetic behavior, and mechanism of the SMA copolymerization by Nd(naph)_3-Al(i-Bu)_3 system are described and discussed. The copolymex of styrenemaleic anhydride prepared by the NdL_3-Al(i-Bu)_3 systems in benzene at 50℃ is an alternating-rich white powder having high number-average molecular weight of 6—8.5×10~5. The overall activation energy for the polymerization was found to be 10.5KJ/mol. The polymerization was not suppressed by addition of hydroquinone. The catalytic activity of various ligands in NdL_3 for the copolymerization decreases in the following order: Nd (naph)_3>Nd-(P_(507))_3～NdCl_3-6H_2O>Nd(P_(204))_3>Nd(acac)_3. 3H_2O. The experimental results are explained based on a mechanism to be the coordination-type copolymerization in terms of the participation of a monomer-monomer complex in propagation.The study on coordination copolymerization of styrene （S） with maleic anhydride （MA） by rare-earth coordination catalysts, NdL₃-Al（i-Bu）₃, has been successfully carried out for the first time. Some features, kinetic behavior, and mechanism of the SMA copolymerization by Nd（naph）₃-Al（i-Bu）₃ system are described and discussed. The copolymex of styrenemaleic anhydride prepared by the NdL₃-Al（i-Bu）₃ systems in benzene at 50℃ is an alternating-rich white powder having high number-average molecular weight of 6—8.5×10⁵. The overall activation energy for the polymerization was found to be 10.5KJ/mol. The polymerization was not suppressed by addition of hydroquinone. The catalytic activity of various ligands in NdL₃ for the copolymerization decreases in the following order: Nd （naph）₃>Nd-(P₅₀₇)₃～NdCl₃-6H₂O>Nd(P₂₀₄)₃>Nd（acac）₃. 3H₂O. The experimental results are explained based on a mechanism to be the coordination-type copolymerization in terms of the participation of a monomer-monomer

关 键 词：RARE-EARTH COORDINATION catalyst STYRENE maleic ANHYDRIDE COORDINATION copolymerization. 

分 类 号：O6[理学—化学]