Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34344
標題: Synthesis and structural characterization of magnesium ketiminate complexes: Efficient initiators for the ring-opening polymerization of L-lactide
作者: Tang, H.Y.
林助傑
Chen, H.Y.
Huang, J.H.
Lin, C.C.
關鍵字: chain-end control
epsilon-caprolactone
cyclic esters
stereoselective
polymerization
immortal polymerization
racemic lactide
coordination
polymerization
metal-complexes
zinc alkoxides
schiff-base
期刊/報告no:: Macromolecules, Volume 40, Issue 25, Page(s) 8855-8860.
摘要: A series of dinuclear magnesium complexes of the type [LMg(mu-OBn)](2) (where L = NNO-tridentate ketiminate ligand) have been prepared. Their activities toward the ring-opening polymerization of L-lactide have been investigated. Experimental results indicate that the reactivity of [LMg(mu-OBn)](2) is dramatically affected by the steric and electronic effect of the substituents on the ketiminate ligand. On the basis of the melting point depression and variable-temperature H-1 NMR studies, it is believed that these magnesium complexes exist as an equilibrium between a monomeric and a dimeric species in solution in which the monomeric species is the most active species during polymerization. The polymerization probably proceeds with the coordination of the lactide to the monomeric species giving a five-coordinated magnesium complex as an intermediate.
URI: http://hdl.handle.net/11455/34344
ISSN: 0024-9297
文章連結: http://dx.doi.org/10.1021/ma071540k
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