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Stereocomplex Crystallization Behavior and Physical Properties of Linear 1‐Arm, 2‐Arm, and Branched 4‐Arm Poly( L ‐lactide)/Poly( D ‐lactide) Blends: Effects of Chain Directional Change and Branching
Author(s) -
Sakamoto Yuzuru,
Tsuji Hideto
Publication year - 2013
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.201200657
Subject(s) - lactide , branching (polymer chemistry) , crystallization , crystallinity , polymer chemistry , materials science , spherulite (polymer physics) , copolymer , polymer , chemistry , composite material , organic chemistry
For number‐average molecular weight ( M n ) below 1 × 10 4 g mol −1 , the comparison of cold crystallization temperature and spherulite growth rate and crystallinity of linear 1‐arm, 2‐arm, and branched 4‐arm poly( L ‐lactide)/poly( D ‐lactide) blends exhibits that the effects of chain directional change and branching significantly disturb stereocomplex crystallization. In contrast, the comparison of glass transition and melting temperatures of linear 1‐arm, 2‐arm, and branched 4‐arm poly( L ‐lactide)/poly( D ‐lactide) blends indicates that the effects of chain directional change and branching insignificantly alter and largely increase the segmental mobility of the blends, respectively, and the crystalline thickness of the blends is determined by M n per one arm not by M n and is not affected by the molecular architecture.