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Photothermal methods and atomic force microscopy images applied to the study of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) dense membranes

Poley, L. H. ; Siqueira, A. P. L. ; da Silva, M. G. ; Sanchez, R. ; Prioli, R. ; Mansanares, A. M. ; Vargas, H.

Journal of applied polymer science, 2005-08, Vol.97 (4), p.1491-1497 [Periódico revisado por pares]

Hoboken: Wiley Subscription Services, Inc., A Wiley Company

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  • Título:
    Photothermal methods and atomic force microscopy images applied to the study of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) dense membranes
  • Autor: Poley, L. H. ; Siqueira, A. P. L. ; da Silva, M. G. ; Sanchez, R. ; Prioli, R. ; Mansanares, A. M. ; Vargas, H.
  • Assuntos: Applied sciences ; diffusion coefficient ; Exact sciences and technology ; Exchange resins and membranes ; Forms of application and semi-finished materials ; photoacoustic spectroscopy ; Polymer industry, paints, wood ; Technology of polymers ; thermal diffusion
  • É parte de: Journal of applied polymer science, 2005-08, Vol.97 (4), p.1491-1497
  • Notas: CNPq
    FAPERJ
    istex:1A974FCD592948B24B13AE53AEFE06A24032509D
    ArticleID:APP21891
    ark:/67375/WNG-CCMH3N0L-P
    CAPES
  • Descrição: 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. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 1491–1497, 2005
  • Editor: Hoboken: Wiley Subscription Services, Inc., A Wiley Company
  • Idioma: Inglês
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