請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/70187
標題: Comparative study of lactide polymerization by zinc alkoxide complexes with a beta-diketiminato ligand bearing different substituents
作者: Chen, H.Y.
Peng, Y.L.
Huang, T.H.
Sutar, A.K.
Miller, S.A.
Lin, C.C.
期刊/報告no:: Journal of Molecular Catalysis a-Chemical, Volume 339, Issue 1-2, Page(s) 61-71.
摘要: A series of beta-diketiminate zinc complexes has been synthesized and their reactivity for the ring-opening polymerization (ROP) of lactide has been studied. The reaction of beta-diketimines (LH) with diethyl zinc forms the monomeric [LZnEt] complexes which further react with benzyl alcohol (BnOH) in toluene/hexane yielding dinuclear or trinuclear zinc complexes. These complexes have been characterized by single crystal X-ray diffraction, which showed the tri- and tetra-coordinated zinc complexes in which zinc atoms exhibit trigonal and tetrahedral geometry, respectively. All complexes have been tested as initiators for the ring-opening polymerization of lactide: they are all highly active. The rate of polymerization is heavily dependent on the N-aryl substituents with the order: alkyl group similar to alkoxy > halide group > nitro group. The beta-diketiminate zinc complexes allow controlled ring-opening polymerization as shown by the linear relationship between the percentage conversion and the number-average molecular weight. On the basis of literature reports, a mechanism for ROP of lactide has been proposed. (C) 2011 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/11455/70187
ISSN: 1381-1169
文章連結: http://dx.doi.org/10.1016/j.molcata.2011.02.013
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