Article (Scientific journals)
Synthesis and characterization of biodegradable homopolymers and block copolymers based on 1,5-dioxepan-2-one
Löfgren, Anders; Albertsson, Ann-Christine; Dubois, Philippe et al.
1994In Macromolecules, 27, p. 5556-5562
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Keywords :
ring-opening polymerization (ROP); lactone
Abstract :
[en] Homopolymers of 1,5-dioxepan-2-one (DXO) and block copolymers of DXO and epsilon-caprolactone (epsilon-CL) have been synthesized with aluminum isopropoxide as an initiator in toluene and tetrahydrofuran (THF). The homopolymerization is first order with respect to both monomer and initiator, and the end-group analysis agrees with a coordination insertion mechanism based on the acyl-oxygen cleavage of the DXO ring. Living poly(epsilon-caprolactone) (PCL) and poly(1,5-dioxepan-2-one) (PDXO) chains are very efficient macroinitiators for the polymerization of DXO and epsilon-CL, respectively, with formation of block copolymers of a narrow molecular weight distribution. Size-exclusion chromatography (SEC) and C-13 NMR confirm the blocky structure of the copolymers, in agreement with DSC that show a melting endotherm for the PCL block and two glass transitions characteristic of the amorphous phases of PDXO and PCL. Because of the crystallinity of the PCL block (T(m) = 60-degrees-C) and the low glass transition temperature of the amorphous PDXO block (T(g) = -39-degrees-C), poly(epsilon-CL-b-DXO-b-epsilon-CL) triblocks have the potential of thermoplastic elastomers. Block copolymers of epsilon-CL and DXO are also sensitive to hydrolysis which makes them possible candidates for biomedical applications. Initiation of the DXO polymerization with functional diethylaluminum alkoxides is also discussed.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry
Materials science & engineering
Author, co-author :
Löfgren, Anders;  The Royal Institute of Technology, Stockholm, Sweden > Department of Polymer Technology
Albertsson, Ann-Christine;  The Royal Institute of Technology, Stockholm, Sweden > Department of Polymer Technology
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 :
Synthesis and characterization of biodegradable homopolymers and block copolymers based on 1,5-dioxepan-2-one
Publication date :
26 September 1994
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
27
Pages :
5556-5562
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
The Swedish Board for Technical Development (NUTEK)
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
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