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Synthesis and thermal behavior of triblock copolymers from L ‐lactide and ethylene glycol with long center PEG block
Author(s) -
MohammadiRovshandeh J.,
Farnia S. M. F.,
Sarbolouki M. N.
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980620)68:12<1949::aid-app8>3.0.co;2-l
Subject(s) - copolymer , ethylene glycol , peg ratio , crystallinity , polymer chemistry , materials science , crystallization , absorption of water , mole fraction , chemical engineering , chemistry , polymer , composite material , finance , engineering , economics
In this study, poly( L ‐lactide)–poly (ethylene glycol) (PLLA–PEG) ABA triblock copolymers with the PEG mole fraction ranging from 27 to 57% have been synthesized, and their thermal properties were investigated. Differential scanning calorimetric thermograms of copolymers obtained from specimens dissolved in CH 2 Cl 2 solution and precipitated with hexane exhibit no crystallization exotherms, but those cast from CHCl 3 solution show some crystallinity. Water absorption depended on the PEG content of copolymers; thus, with a PEG mole fraction of 57, the water absorption was 82%. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1949–1954, 1998