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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

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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.