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Effect of temperature and pressure treatment on the porosity of expanded polytetrafluoroethylene films

Hall, P.J. and Hitchman, Michael J. and Brown, Stephen D. and Calo, J.M. (2003) Effect of temperature and pressure treatment on the porosity of expanded polytetrafluoroethylene films. Journal of Applied Polymer Science, 89 (6). pp. 1579-1582. ISSN 0021-8995

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Abstract

Small-angle neutron scattering was performed on a series of expanded polytetrafluoroethylene membranes that were subjected to thermal treatment at a maximum of 320degreesC at pressures up to 517 kPa. The scattering data indicate the existence of monodisperse pores of 2.7-Angstrom radius, and a polydisperse set of scatterers with surface fractal properties. The thermal treatment had no significant effect on the structure, given that the maximum temperature was below the softening point of the polymer. The effect of increasing pressure was to increase the fractal dimension and to decrease the porosity void fractions. A linear relationship was noted between the Porod invariant values and the applied pressure. The pressure treatment had no effect on the size of the 2.7-Angstrom pores.

Item type: Article
ID code: 17368
Keywords: expanded PTFE, porosity, small-angle neutron scattering, surfaces, monodispersity, Chemical technology, Chemistry, Materials Chemistry, Polymers and Plastics, Surfaces, Coatings and Films, Chemistry(all)
Subjects: Technology > Chemical technology
Science > Chemistry
Department: Faculty of Engineering > Chemical and Process Engineering
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 27 Apr 2010 13:52
    Last modified: 05 Sep 2014 01:20
    URI: http://strathprints.strath.ac.uk/id/eprint/17368

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