Triblock copolymers of lactide with poly(ethylene glycol) and influence of stereochemical composition

Polymerization of L‐lactide (LLA) and poly(ethylene glycol) (PEG) at 120°C using stannous 2‐ethyl hexanoate results in ABA triblock copolymers in good yields. The glass transition temperature of the copolymers shows strong dependence on the composition. One‐ and two‐phase triblock copolymers can be...

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Bibliographic Details
Published inMacromolecular symposia. Vol. 193; no. 1; pp. 143 - 158
Main Authors Onyari, John M., Huang, Samuel J.
Format Journal Article
LanguageEnglish
Published Weinheim WILEY-VCH Verlag 01.03.2003
WILEY‐VCH Verlag
Subjects
Block copolymers
Charge
Copolymers
Crystallinity
Glass transition temperature
Glycols
Molecular weight
Polymerization
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Summary:Polymerization of L‐lactide (LLA) and poly(ethylene glycol) (PEG) at 120°C using stannous 2‐ethyl hexanoate results in ABA triblock copolymers in good yields. The glass transition temperature of the copolymers shows strong dependence on the composition. One‐ and two‐phase triblock copolymers can be prepared by controlling the molecular weight of the PEG soft block, as well as the initial LLA/PEG charge ratio. Incorporation of racemic lactide during polymerization drastically affects the crystallinity of the block copolymers obtained. 1H and 13C (solid state) NMR are powerful tools for characterization of the polymer materials.
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ISSN:1022-1360
1521-3900
DOI:10.1002/masy.200390048