Synthesis and thermal behavior of triblock copolymers from L-lactide and ethylene glycol with long center PEG block

✍ Scribed by J. Mohammadi-Rovshandeh; S. M. F. Farnia; M. N. Sarbolouki

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 140 KB
• Volume: 68
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980620)68:12<1949::aid-app8>3.0.co;2-l

✦ Synopsis

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%.