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Thermophysical properties of linear perfluorinated alcohols


J. Costa1, M. Fulem2, B. Schroder3, J. Coutinho3, M. Monte1 and L. Santos1

1CIQ, Departamento de Quimica e Bioquimica, Faculdade de Ciencias da Universidade do Porto, Porto, Portugal
2Department of Physical Chemistry, Institute of Chemical Technology Technicka, Prague, Czech Republic
3CICECO, Departamento de Quimica, Universidade de Aveiro, Aveiro, Portugal

Keywords: vapour pressures, fusion, sublimation, vaporization, phase diagram, DSC, mks capacitance diaphragm manometer
property: phase stability, vapour pressures, enthalpies and entropies of phase transition
material: perfluorcarbon alchools, perfluorinated organic compounds

Perfluorocarbon alcohols (PFAs) are a type of perfluorinated organic compounds used in numerous commercial products such as fire and textile protection agents, floor polishers, detergents, paints, paper treatment agents and electronic equipment [1, 2]. The study of thermophysical properties of this type of compounds is an important research target in our laboratory [3]. In this work, a contribution to the phase transitions study and vapour pressures determinations of C7, C8, C9, C10 and C11 perfluorocarbon alcohols series will be presented. For each of these compounds, the temperature and the molar enthalpies of fusion were measured in a power compensated differential scanning calorimetry (DSC) (SETARAM model 141). The vapour pressures at different temperatures were measured using a static apparatus based on a MKS capacitance diaphragm manometer. Based on the previous results, the standard molar enthalpies, entropies and Gibbs energies of sublimation were derived at 298.15 K. The thermodynamic results obtained in this work were used to evaluate the solid-liquid, solid-gas and liquid-gas equilibria in terms of the contribution of the perfluoralkyl chain length and compared with the predictions obtained by COSMO-RS.

Thanks are due to Fundação para a Ciencia e Tecnologia (FCT) and Programa Operacional Ciencia e Inovaçao 2010 (POCI 2010) for the financial support to Project POCI/QUI/61873/2004, supported by the European Community Fund FEDER. J.C.S. also thanks FCT and the European Social Fund (ESF) under the third Community Support Framework (CSF) for the award of Ph.D. Research Grants SFRH/BD/74367/2010.

References
  1. M. Joyce, A. Dinglasan-Panlilio and S.A. Mabury, Environ. Sci. Technol. 40, 1447 (2006)

  2. H. Yoo, H. W. Washington, J.J. Ellington, T.M. Jenkins and M.P. Neill, Environ. Sci. Technol. 44, 8397 (2010)

  3. M.G. Freire, P.J. Carvalho, L.M.N.B.F. Santos, L.R. Gomes, I.M. Marrucho and J.A.P. Coutinho, J. Chem. Therm. 42 213 (2010)

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