Macromolecular engineering of polylactones and polylactides. 8. Ring-opening polymerization of ε-caprolactone initiated by primary amines and trialkylaluminum
[en] Whenever added with triethylaluminum, primary amines have been found to be effective initiators for epsilon-caprolactone polymerization in both toluene and THF at 40°C. The IR and NMR analysis of the polyester has supported a polymerization mechanism proceeding through a "coordination-insertion" pathway and the selective rupture of the acyl-oxygen bond of the monomer. The alkylaluminum activates the carbonyl group of the monomer and accordingly favors the nucleophilic addition of the amine, which is the actual initiation step. Propagation is typically a living process, and the molecular weight distribution is controlled by both AlEt3/amine molar ratio and solvent As an extension of that mechanism, diethylaluminum omega-amino alkoxide has been prepared on purpose and successfully used as an initiator for the synthesis of α,ω-dihydroxypoly(ε-caprolactone).
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Dubois, Philippe; Université de Liège - ULiège > Department of Chemistry > Laboratory of Macromolecular Chemistry and Organic Catalysis
Degée, Philippe; Université de Liège - ULiège > Department of Chemistry > Laboratory of Macromolecular Chemistry and Organic Catalysis
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Laboratory of Macromolecular Chemistry and Organic Catalysis
Teyssié, Philippe ; Université de Liège - ULiège > Department of Chemistry > Laboratory of Macromolecular Chemistry and Organic Catalysis
Language :
English
Title :
Macromolecular engineering of polylactones and polylactides. 8. Ring-opening polymerization of ε-caprolactone initiated by primary amines and trialkylaluminum
Publication date :
05 November 1992
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
American Chemical Society, Washington, United States - District of Columbia
BELSPO - Politique scientifique fédérale [BE] IRSIA - Institut pour l'Encouragement de la Recherche Scientifique dans l'Industrie et l'Agriculture [BE]
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