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標題: Catalysts for the ring-opening polymerization of epsilon-caprolactone and L-lactide and the mechanistic study
作者: Yu, T.L.
Wu, C.C.
Chen, C.C.
Huang, B.H.
Wu, J.C.
Lin, C.C.
關鍵字: magnesium;catalyst;L-lactide;cyclic esters polymerization;single-site catalysts;chain-end control;immortal polymerization;living polymerization;stannous octoate;racemic lactide;stereoselective polymerization;efficient catalysts;aluminum porphyrin
Project: Polymer
期刊/報告no:: Polymer, Volume 46, Issue 16, Page(s) 5909-5917.
Two novel magnesium aryloxides have been prepared and their catalytic activities toward ring-opening polymerization (ROP) of epsilon-caprolactone and L-lactide have been investigated. The reaction of 2,2'-(2-methoxybenzylidene)-bis(4,6-di(1-methyl-1-phenylethyl)phenol) (MEMPEP-H(2)) (1) and 2,2'-methylene-bis(4,6-di(1-methyl-1-phenylethyl)phenol) (MMPEP-H(2)) with "Bu(2)Mg yield dimeric magnesium complexes [Mg(mu-MEMPEP)(THF)](2) (2) and [Mg(mu-MMPEP)(THF)](2) (3), respectively. Catalytic studies of complexes 2 and 3 illustrate that both 2 and 3 are good catalysts in epsilon-caprolactone and L-lactide polymerization. Theoretical study of the ROP mechanism of epsilon-caprolactone catalyzed by 2 demonstrates that the initiator, benzyl alcohol, is activated by the formation of a hydrogen bond with the phenoxy oxygen of MEMPEP(2-) ligand. (c) 2005 Elsevier Ltd. All rights reserved.
ISSN: 0032-3861
DOI: 10.1016/j.polymer.2005.04.079
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