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Separate Crystallization and Cocrystallization of Poly( L ‐lactide) in the Presence of L ‐Lactide‐Based Copolymers With Low Crystallizability, Poly( L ‐lactide‐ co ‐glycolide) and Poly( L ‐lactide‐ co ‐ D ‐lactide)
Author(s) -
Tsuji Hideto,
Tashiro Kohji,
Bouapao Leevameng,
Hanesaka Makoto
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.201200208
Subject(s) - lactide , crystallization , polymer chemistry , copolymer , crystallite , materials science , chemistry , chemical engineering , crystallography , composite material , polymer , organic chemistry , engineering
Poly( L ‐lactide) (PLLA) and poly( L ‐lactide‐ co ‐glycolide) (78/22)0 [P(LLA‐GA)] were phase‐separated in PLLA/P(LLA‐GA) blends, forming independent domains and thence crystallizing separately. The crystallization of PLLA was not disturbed or delayed by the presence of P(LLA‐GA) and vice versa. PLLA and poly(L‐lactide‐ co ‐ D ‐lactide) (77/23) [P(LLA‐DLA)] were miscible in the PLLA/P(LLA‐DLA) blends, overall crystallization was delayed, and the growth of crystallites was disturbed in the presence of P(LLA‐DLA). In isothermal crystallization, the originally noncrystallizable P(LLA‐DLA) became crystallizable in the presence of PLLA, with which it cocrystallized. The disturbance effect on periodical lamella twisting of PLLA was larger for P(LLA‐GA) than for P(LLA‐DLA).