Porous structure of membranes of an acrylonitrile copolymer. Porosity, 1H-NMR permeability |
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Authors: | A Viallat MM Margulies |
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Institution: | (1) Laboratoire de Spectrométrie Physique, Université J. Fourier, CNRS (UMR C5588.), BP 87, 38402 Saint Martin d'Héres cedex, France, FR |
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Abstract: | Nanoporous polymer membranes (porosity ) used for dialysis are studied from NMR relaxation times of water confined in the pore space. Fast interpore water diffusion
is observed. Two structural parameters are evidenced: i) a reduced NMR relaxation time, , which reflects the width of the pore-size distribution; ii) the average polymer-grain size of the solid matrix deduced from
NMR experiments performed on membranes partially filled by water. A relation is found between the ratio , where k is the permeability to water and the porosity. This relation is in qualitative agreement with numerical simulations reported
in the literature on low-porosity systems and with experimental results obtained for sedimentary rocks and for fused glass
model systems. It supports the idea that is the relevant structural parameter to describe convective transport in a wide class of porous systems.
Received 8 July 1999 |
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