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Type: Artigo de periódico
Title: Investigation of cellulose acetate viscoelastic properties in different solvents and microstructure
Author: Ferrarezi, MMF
Rodrigues, GV
Felisberti, MI
Goncalves, MD
Abstract: This paper deals with the effect of solvent on the viscoelastic properties and microstructure of cellulose acetate (CA) by means of rheological measurements, dynamic-mechanical analysis and scanning electron microscopy. Acetone, acetic acid, dimethylacetamide (DMAc) and dimethylformamide (DMF) were used as good solvents and water as a non-solvent. The addition of water in the cellulose acetate/solvent mixture led to the development of an intense shear thinning behavior, as it caused the formation of CA agglomerates which were disrupted in a steady shearing condition. Apart from this, a three-dimensional elastic gel behavior in the CA/DMF/water and CA/DMAc/water solutions was observed during dynamical rheological analysis. The formation of CA agglomerates was controlled by the solvent type and resulted in microstructure changes, going from a dense structure to a porous one, and also influenced the CA chain rigidity and consequently the glass transition temperatures of the CA films. (C) 2013 Elsevier Ltd. All rights reserved.
Subject: Cellulose acetate
Elastic gel
Solvent effect
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Citation: European Polymer Journal. Pergamon-elsevier Science Ltd, v. 49, n. 9, n. 2730, n. 2737, 2013.
Rights: fechado
Identifier DOI: 10.1016/j.eurpolymj.2013.06.007
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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