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Type: Artigo de periódico
Title: Photothermal methods and atomic force microscopy images applied to the study of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) dense membranes
Author: Poley, LH
Siqueira, APL
da Silva, MG
Sanchez, R
Prioli, R
Mansanares, AM
Vargas, H
Abstract: Thermal and transport properties of some polyhydroxyalkanoates (PHAs), poly-3- hydroxybutyrate and poly-3-hydroxybutyrate-co-3-hydroxyvalerate copolymers at different concentrations (8, 14, and 22%), were studied by using photoacoustic and photothermal techniques. Mass diffusion coefficients were obtained for carbon dioxide and oxygen by using a gas analyzer. Specific heat capacity measurements were performed by monitoring temperature of the samples under white light illumination against time. Thermal diffusivities were determined by using the open photoacoustic cell configuration. The results were discussed considering the incorporation of hydroxyvalerate units in the poly(3-hydroxybutyrate) unit cell and were correlated with atomic force microscopy images of the upper surface of membranes. New information on transport properties of PHAs is provided. (c) 2005 Wiley Periodicals, Inc.
Subject: diffusion coefficient
thermal diffusion
photoacoustic spectroscopy
Country: EUA
Editor: John Wiley & Sons Inc
Citation: Journal Of Applied Polymer Science. John Wiley & Sons Inc, v. 97, n. 4, n. 1491, n. 1497, 2005.
Rights: fechado
Identifier DOI: 10.1002/app.21891
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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