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. Issue 9 (16th June 2016)

• Record Type: Journal Article
• Authors: Lee, Chan Woo; Na, Chao; Kimura, Yoshiharu; Masutani, Kazunari
• Is Part Of: Macromolecular materials and engineering. Volume 301:Issue 9(2016)
• Page Start: 1121
• Page End: 1131
• Publication Date: 2016-06-16
• Subjects: pentablock copolymer -- poly(butylene succinate) -- poly(d‐lactide) -- poly(l‐lactide) -- stereocomplex; Plastics -- Periodicals; Polymers -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1002/mame.201600158
• Languages: English
• ISSNs: 1438-7492

Abstract

Abstract : ABCBA 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 ofd ‐ andl ‐lactides in the presence of bis‐hydroxyl‐terminated PBS prepolymer as an initator. The pentablock copolymers (PLLA‐PDLA‐PBS‐PDLA‐PLLA) as well as the triblock copolymers (PLLA‐PBS‐PLLA) show different properties depending on the polymer compositions. Abstract : 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 ofd ‐ andl ‐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.