Picture of virus under microscope

Research under the microscope...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

Explore SIPBS research

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

Full text not available in this repository. (Request a copy from the Strathclyde author)

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.