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Oxygen and water vapor permeability of fully substituted long chain cellulose esters (LCCE)

Bras, Julien and Vaca-Garcia, Carlos and Borredon, Marie-Elisabeth and Glasser, Wolfgang Oxygen and water vapor permeability of fully substituted long chain cellulose esters (LCCE). (2007) Cellulose, 14 (4). 367-374. ISSN 0969-0239

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Official URL: https://doi.org/10.1007/s10570-007-9123-2

Abstract

Fully-substituted cellulose esters with acyl substituents ranging in size from C2 to C18 were synthesized using the acyl chloride method. Films were prepared from the purified esters by either solvent-casting or compression-molding at elevated temperatures. Oxygen and water vapor permeability was determined under different conditions of pressure and moisture. The relationship between cellulose ester structure and barrier properties was examined. The results revealed linear relationships between water vapor and oxygen permeabilities and molar ester substituent volume as well as several structural factors relating to polymer polarity and hydrophobicity, such as aliphatic (methylene) content, solubility parameter, and contact angle. Films from long chain cellulose esters (LCCE) with acyl substituents in the size range between C8 and C18 were found to represent effective barriers to water vapor transport while their obstruction to the transfer of oxygen remained low. It was concluded that the hydrophobic nature of LCCEs is responsible for the control of water vapor transport, and that spatial factors dominate the transfer of oxygen.

Item Type:Article
HAL Id:hal-02058611
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Institut polytechnique de Grenoble (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Other partners > Virginia Polytechnic Institute and State University (USA)
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Deposited By: Yves MOMBOISSE
Deposited On:06 Mar 2019 07:39

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