Influence of the nature of the ligand on the microstructure of poly d,l-lactides prepared with organoaluminum initiators |
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| Authors: | J. Belleney M. Wisniewski |
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| Affiliation: | a Laboratoire de Chimie des Polymères UMR 7610, Université Pierre et Marie Curie, T.44 C 185, 4 Place Jussieu, 75252 Paris Cedex 05, France
b Laboratoire de Recherche sur les Polymères, CNRS, UMR 7581, Université Paris Val de Marne, 2 à 8 Rue Henri Dunant, 94320 Thiais, France |
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| Abstract: | The polymerization of d,l-lactide with organoaluminum initiators bearing two different ligands, acetylacetone (1) and achiral Schiff’s base (2), has been studied. The microstructure of the obtained polymers analyzed by high resolution 13C NMR (125 MHz) is strongly influenced by the nature of the ligand. Al(acac)3 (1) leads to stereocopolymers having random repartition of configurational units while polylactides prepared with aluminum methoxide derivatives bearing as ligand Schiff’s base (2) present some degree of stereoregularity with preferential formation of isotactic sequences.Variation of the ligand linked to the initiator appears as one of the best tools for the moulding of the microstructure of obtained polylactides. |
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| Keywords: | smallcaps" >d, smallcaps" >l-lactide Organoaluminum initiators 13C NMR Microstructure Ligand effect Stereoselectivity Propagation statistics |
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