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Water Vapor Permeability of Poly( L ‐lactide)/Poly( D ‐lactide) Stereocomplexes
Author(s) -
Tsuji Hideto,
Tsuruno Tomonori
Publication year - 2010
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.201000071
Subject(s) - crystallinity , crystallite , materials science , lactide , amorphous solid , enantiomer , chemical engineering , polymer , permeability (electromagnetism) , polymer chemistry , composite material , crystallography , stereochemistry , copolymer , chemistry , biochemistry , membrane , engineering , metallurgy
PLLA/PDLA blend films with only stereocomplex crystallites as a crystalline species together with pure PLLA and PDLA films with only homo‐crystallites as a crystalline species were prepared, and the effects of enantiomeric polymer blending, crystalline species, and crystallinity on the water vapor permeability were investigated. The WVT coefficient P of PLLA/PDLA blend films was 14–23% lower than that of pure PLLA and PDLA films in the crystallinity X c range of 0–30%. Amorphous PLLA/PDLA blend films have a much lower P than pure PLLA and PDLA films. The dependence of P on X c for blend films was stronger for X c = 0–30% than for X c = 30–100%. This dependence is discussed using the Nielsen model and the concept of “restricted” (or “restrained”) and “free” amorphous regions.