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Triblock copolymers of lactide with poly(ethylene glycol) and influence of stereochemical composition
Author(s) -
Onyari John M.,
Huang Samuel J.
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200390048
Subject(s) - copolymer , ethylene glycol , polymer chemistry , peg ratio , polymerization , polymer , materials science , lactide , crystallinity , glass transition , ethylene , chemistry , organic chemistry , catalysis , finance , economics , composite material
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. 1 H and 13 C (solid state) NMR are powerful tools for characterization of the polymer materials.