Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/89454
Type: Artigo de periódico
Title: Investigation Of Cellulose Acetate Viscoelastic Properties In Different Solvents And Microstructure
Author: Ferrarezi M.M.F.
Rodrigues G.V.
Felisberti M.I.
Goncalves M.D.C.
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. © 2013 Elsevier Ltd. All rights reserved.
Editor: 
Rights: fechado
Identifier DOI: 10.1016/j.eurpolymj.2013.06.007
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84881369650&partnerID=40&md5=45e73625a4fb5cd725c8ce3e44311bee
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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