Synthesis and characterization of novel ABA triblock copolymers from L-lactide, glycolide, and PEG

A series of novel triblock copolymers, consisting of a poly(ethylene glycol) center block joined by two blocks of random L‐lactide/glycolide copolymers, are synthesized and their characteristics (spectral, thermal, and mechanical) determined. Polymer compositions and structures are assessed via 1H‐NMR and 13C‐NMR spectroscopies. DSC and stress–strain behavior studies demonstrate that these copolymers are generally more amorphous, more elastic, and tougher than are poly(L‐lactides). © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 2004–2009, 1999