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Skinned polymeric membranes. Approach to the mechanism of formation of surface holes
Author(s) -
Addad J. P. Cohen,
Icard B.,
Pellicioli L.
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210380312
Subject(s) - membrane , solvent , diffusion , polymer chemistry , materials science , polymeric membrane , chemical engineering , chemistry , thermodynamics , physics , organic chemistry , biochemistry , engineering
It is shown quantitatively that the formation of holes through the skin of membranes, prepared by the quick immersion in water of polyetherimides in solution in N ‐methylpyrrolidone, is governed by the solvent mobility. The surface pattern observed by videomicroscopy exhibits a characteristic distance between neighbouring holes (≃5 μm) which is a linear function of D −1 s ; D s is the solvent diffusion coefficient in the polymeric solution, measured using a pulsedfield gradient NMR technique. The dependence of this distance on the solvent concentration in water is also characterized.