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Membrane formation through the phase‐inversion of Poly(vinylidene)/Dimethylformamide solutions. Experimental and theoretical study of evaporative flux
Author(s) -
Francesconi R.,
Castellari C.
Publication year - 1988
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450660308
Subject(s) - phase inversion , thermodynamics , flux (metallurgy) , inversion (geology) , solvent , mass flux , membrane , polymer solution , dimethylformamide , materials science , chemistry , statistical physics , polymer , physics , organic chemistry , geology , paleontology , biochemistry , structural basin
The phase inversion of a polymeric solution is modeled assuming the validity of the diffusion equation and the existence of a mass‐cumulative stagnant film of vapor on the cast membrane. Unlike previous analyses, the model predicts a maximum in the evaporative flux leaving the polymeric solution. A comparison of theory with experiments indicates that the solvent flux is predicted only qualitatively. The discrepancy is probably due to some assumptions introduced, for mathematical tractability, in the model.