Poly(L-lactide-b-γ-benzyl glutamate) copolymers with various block lengths were synthesized by sequential ring-opening polymerization of L-lactide and N-carboxyanhydride of γ-benzyl glutamate. The copolymers were characterized by SEC and NMR spectrometry. DSC and SAXS data suggested that the copolymers were phase-separated in domains containing either crystalline PLLA or liquid-crystalline columnar hexagonal morphology of PBLG. When varying the temperature, reversible local order-order transition could be observed on these diblock copolymers.

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