期刊
POLYHEDRON
卷 27, 期 1, 页码 319-324出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2007.09.021
关键词
(S)-N-ethyl-N-phenyl-2-pyrrolidinemethanamine; chiral zinc complex; polylactide; stereocontrol of polylactide; X-ray structure
The reaction between ZnCl2 and (S)-N-ethyl-N-phenyl-2-pyrrolidinemethanamine (S-EPP) as a chiral ligand affords [ZnCl2(S-EPP)], whose structure has been determined by X-ray crystallography. [ZnEt2(S-EPP)] has demonstrated high activity toward the polymerization of rac-lactide with a maximum turnover frequency (TOF) of 121. Despite the intended stereocontrol by employing a chiral ligand, however, the observed heterotacticity was limited to under 0.6. The MWDs of the PLAs were found to be modulated by changing the solvent or controlling the concentration of the monomer in the solution. The glass transition temperature (T-g) was critically dependent on the MW within the narrow MWD regime, but the dependence became significantly shallow when the MWD was broadened. (C) 2007 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据