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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 CH₂Cl₂ solution and precipitated with hexane exhibit no crystallization exotherms, but those cast from CHCl₃ 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