Synthesis and Characterization of Poly（Lactide）s Using Novel Solid Cloisite Modified Tin Catalyst  

作　　者：Balaji Sidram Selukar Asutosh Kumar Pandey Smita Sunil Nande Avinash Santram Bansode and Baijayantimala Gamaik 

机构地区：[1]Polymer Science and Engineering Division, National Chemical Laboratory, Pune 411008, India

出　　处：《Journal of Chemistry and Chemical Engineering》2012年第1期54-60,共7页化学与化工（英文版）

摘　　要：A novel cloisite modified solid catalyst was prepared in a single step from commercially available starting materials for the first time. The ring opening polymerization of L-lactide and D-lactide using this cloisite modified solid catalyst resulted in homopolymers of 75,000 and PDI = 1.6 and the maximum molecular weight （Mw） i.e. 180,000 with PDI = 1.9 were obtained. The catalytic activity ofcloisite modified solid catalyst was compared with the conventional stannous octoate catalyst and found superior to stannous octoate in all respect such as conversion, molecular weight and molecular weight distribution etc.. Moreover, the maximum molecular weight i.e. 180,000 was obtained at 220 ℃, whereas, transesterification reaction predominate in presence of stannous octoate The linear structure was confirmed by quantitative ^13C NMR Spectroscopy. Blend films were obtained by casting mixed solutions of poly （D-lactide） and poly （L-lactide） at various compositions, and stereocomplex was formed at 50/50 composition with molecular weight of 75,000.

关 键 词：Solid cloisite modified tin catalyst stannous octoate ROP stereocomplex. 

分 类 号：O643.36[理学—物理化学] TQ426.6[理学—化学]