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Effect of a plasticizer on the structure of biodegradable starch/clay nanocomposites: Thermal, water‐sorption, and oxygen‐barrier properties
Author(s) -
Zeppa C.,
Gouanvé F.,
Espuche E.
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29588
Subject(s) - montmorillonite , plasticizer , nanocomposite , organoclay , materials science , sorption , oxygen permeability , thermal stability , chemical engineering , starch , polymer chemistry , composite material , oxygen , chemistry , organic chemistry , adsorption , engineering
In this study, we investigated nanocomposites based on a plasticized natural biodegradable matrix. The polymer used was a natural potato starch, and the plasticizers were glycerol and a urea/ethanolamine mixture. A natural and an organically modified montmorillonite were studied. Two series of films containing 6 wt % nanoclays were prepared by a solution/cast process: the first series was based on neat starch, and the second one was based on 20 wt % plasticized starch. For all matrices, a mixture of intercalated and exfoliated structures was formed by the addition of pristine montmorillonite, whereas an aggregate structure was obtained with organoclay. The thermal stability was not significantly influenced by the addition of clays. Water sorption was examined as a function of the matrix and clay hydrophilicity. The significant reduction of oxygen permeability obtained with natural montmorillonite was related to the high dispersion state of this clay. For urea–ethanolamine composites, specific compatibilizer/clay interactions led to an improvement again in the barrier properties. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009