Ring-opening polymerization of 2,2-dimethyltrimethylene carbonate using rare earth aryl oxides substituted by alkyl groups

作     者：Zhang, Li Fang Wang, Yan Wang, Pei Shen, Li Juan 

作者机构：Institute of Material Chemistry Shanxi Normal University Linfen 041004 China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2010年第53卷第3期

页      面：598-603页

核心收录：

学科分类：07[理学] 0703[理学-化学] 

基　　金：support from the Natural Science Foundation of Shanxi Province (Grant No 2006011069) the Opening Foundation of Key Laboratory of Shanxi Province (Grant No 2009011059-7) 

主　　题：ring-opening polymerization 2 2-dimethyltrimethylene carbonate rare earth aryl oxides 

摘      要：Single component rare earth aryl oxides substituted by various alkyl groups [Ln(OAr)3] such as methyl,isopropyl,and tertbutyl have been developed to initiate the ring-opening polymerization of 2,2-dimethyltrimethylene carbonate(DTC).The catalytic activity of rare earth aryl oxides,characteristics of the ring-opening polymerization as well as the polymerization kinetics and mechanism were intensively *** experimental results turn out that the catalytic activity of Ln(OAr)3 changes in good concordance with variation of ligands structure and number of alkyl groups on benzene *** greater the ability of electron-donation of alkyl groups,the greater the catalytic ***,the greater the number of substituted alkyls on benzene ring,the greater the catalytic *** results show that rare earth tris(2,4,6-tri-tert-butylphenolate)s [Ln(OTTBP)3](Catalyst 1) exhibit rather great activity in all lanthanide aryl *** of the polymerization mechanism by 1H NMR spectroscopy revealed that the DTC monomer inserted into the growing chains with acyloxygen bond cleavage.