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Relatively Short Poly( D ‐lactide) Segments as Intra‐ C rystallization‐ A ccelerating Moieties in Stereo Diblock Poly(lactide)s
Author(s) -
Tsuji Hideto,
Tajima Tomohiko
Publication year - 2014
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.201300224
Subject(s) - lactide , crystallization , materials science , thermal stability , crystallite , polymer chemistry , chemical engineering , polymer , composite material , copolymer , engineering , metallurgy
The homo‐crystallization of stereo diblock poly(lactide)s with high number‐average molecular weight (M ‾ n ) values of ca. 10 5 g mol −1 is accelerated by the incorporated relatively short poly( D ‐lactide) (PDLA) segments withM ‾ n = 2.0–7.7 × 10 3 g mol −1 during heating and PDLA segments withM ‾ n = 3.5 and 7.7 × 10 3 g mol −1 during cooling. The relatively short PDLA segments linked to PLLA segments, which have sufficient lengths to form stereocomplex crystallites, are very effective to shorten a crystallization timeand to increase the productivity and thermal stability.