Synthesis and Thermomechanical Properties of Stereo Triblock Polylactides With Nonequivalent Block Compositions | Zendy

Masutani Kazunari | Zendy; Lee Chan Woo | Zendy; Kimura Yoshiharu | Zendy

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Synthesis and Thermomechanical Properties of Stereo Triblock Polylactides With Nonequivalent Block Compositions

Author(s) -

Masutani Kazunari,

Lee Chan Woo,

Kimura Yoshiharu

Publication year - 2012

Publication title -

macromolecular chemistry and physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.57

H-Index - 112

eISSN - 1521-3935

pISSN - 1022-1352

DOI - 10.1002/macp.201100683

Subject(s) - crystallinity , polymer chemistry , crystallization , materials science , enantiomer , block (permutation group theory) , lactide , copolymer , chemistry , composite material , stereochemistry , polymer , organic chemistry , mathematics , geometry

ABA stereo triblock polylactides consisting of PLLA and PDLA are prepared by two‐step ROP of L ‐ and D ‐lactides. In the first step, PDLA prepolymers with bishydroxyl terminals are prepared that are then used as macroinitiators in the ROP of L ‐lactide to obtain the target t‐sb‐PLAs with different block compositions. The resultant t‐sb‐PLAs with nonequivalent PLLA/PDLA compositions form stereocomplex crystals without homochiral crystallization. Their sc crystallinity and thermomechanical properties are dramatically improved by enantiomeric adjustment of PLLA‐rich t‐sb‐PLAs with PDLA‐rich t‐sb‐PLAs having complementary PLLA/PDLA composition.

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