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ABCBA Pentablock Copolymers Consisting of Poly( l ‐lactide) (PLLA: A), Poly( d ‐lactide) (PDLA: B), and Poly(butylene succinate) (PBS: C): Effects of Semicrystalline PBS Segments on the Stereo‐Crystallinity and Properties
Author(s) -
Lee Chan Woo,
Na Chao,
Kimura Yoshiharu,
Masutani Kazunari
Publication year - 2016
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201600158
Subject(s) - copolymer , materials science , lactide , crystallinity , polymer chemistry , condensation polymer , polymer , prepolymer , polybutylene succinate , crystallization , polymerization , chemical engineering , composite material , polyurethane , engineering
A new stereo pentablock copolymer consisting of poly( l ‐lactide) (PLLA: A), poly‐ d ‐lactide (PDLA: B), and poly(butylene succinate) (PBS: C) is synthesized by two‐step ring‐opening polymerization of d ‐ and l ‐lactides in the presence of bis‐hydroxyl‐terminated PBS prepolymer that has been prepared by the ordinary polycondensation. The pentablock copolymers (PLLA‐PDLA‐PBS‐PDLA‐PLLA) as well as the triblock copolymers (PLLA‐PBS‐PLLA) obtained as the intermediates show different properties depending on the polymer compositions. In the pentablock copolymers, the direct connection of the PLLA and PDLA blocks allows easy formation of the stereocomplex crystals, while the introduction of the semicrystalline PBS block is effective not only for changing the crystallization kinetics but also for imparting an elastomeric property.