[en] Commercially available Al isopiopoxide (Al(OiPr)3) has proved to be an efficient initiator for the bulk polymerization of lactide. The ring-opening polymerization proceeds through a "coordination-insertion" mechanism and the selective rupture of the acyl-oxygen bond of the monomer Polyester chains are selectively end-capped with an aluminum alkoxide and an isopropoxy group. Therefore, substitution of Al tris(4-penten-1-olate) for Al(OiPr)3 leads to the formation of macromonomers In the temperature range from 110 to 150°C, polymerization is "living", i.e. the molecular weight can be predicted by the initial monomer-to-Al molar ratio and the monomer conversion. The narrower polydispetsity of poly(L,L-lactide) compared to the amorphous poly(D,L-lactide) ( 1.3 compared to 1.9, respectively), both prepared in the bulk, is thought to result from the restricted mobility of the crystallized isotactic polyester chains. When the temperature is increased up to 180°C, inter- and intramolecular transesterification reactions interfere with chain propagation.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Degée, Philippe; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Dubois, Philippe ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Bulk polymerization of lactides initiated by aluminum isopropoxide. 1. Mechanism and kinetics
Publication date :
September 1997
Journal title :
Macromolecular Symposia
ISSN :
1022-1360
eISSN :
1521-3900
Publisher :
Wiley-V C H Verlag Gmbh, Weinheim, Germany
Volume :
123
Pages :
67-84
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BELSPO - Belgian Federal Science Policy Office IRSIA - Institut pour l'Encouragement de la Recherche Scientifique dans l'Industrie et l'Agriculture
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Bibliography
A. Löfgren, A.C. Albertsson, Ph. Dubois, R. Jérôme, J. Macromol. Sci., Rev. Macromol. Chem. Phys. C35, 379 (1995)
Duda, S. Penczek, Macromolecules 23, 1636 (1990)
K. Jamshidi, R.C.E. Ebehart, S.H. Hyon, Y. Ikada, Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.) 28, 236 (1987)
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