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Highly Enhanced Accelerating Effect of Melt‐Recrystallized Stereocomplex Crystallites on Poly( L ‐lactic acid) Crystallization, 2–Effects of Poly( D ‐lactic acid) Concentration
Author(s) -
Narita Junichi,
Katagiri Mikio,
Tsuji Hideto
Publication year - 2013
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.201200060
Subject(s) - crystallite , crystallization , materials science , amorphous solid , lactic acid , atmospheric temperature range , chemical engineering , crystallography , bacteria , metallurgy , chemistry , thermodynamics , physics , biology , engineering , genetics
The effects of varying concentrations of incorporated PDLA on the acceleration of PLLA homo‐crystallization due to stereocomplex (SC) crystallite formation are investigated in PLLA films doped with PDLA over the wide concentration range of 1–10 wt%. PLLA homo‐crystallization is accelerated for all the PDLA concentrations when the processing temperature T p is just above the endset melting temperature of the SC crystallites ( T p = 226–238 °C), although the appropriate T p range becomes narrow at low concentrations of PDLA. The accelerating effects of SC crystallites depend on the SC crystalline thickness and the interaction between the SC crystalline regions and PLLA amorphous regions for T p s below and above the melting peak temperature of the SC crystallites, respectively.