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Water Vapor Permeability of Poly(L-lactide)/Poly(D-lactide) Stereocomplexes

✍ Scribed by Hideto Tsuji; Tomonori Tsuruno

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
546 KB
Volume
295
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

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.

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