The mechanism of formation of microporous or skinned membranes produced by immersion precipitation

J.G. Wijmans; J.P.B. Baaij; C.A. Smolders

doi:10.1016/0376-7388(83)80005-2

The mechanism of formation of microporous or skinned membranes produced by immersion precipitation

J.G. Wijmans, J.P.B. Baaij, C.A. Smolders

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Abstract

Cellulose acetate and polysulfone casting solutions were coagulated in water/solvent mixtures with differing solvent content. Precipitation in pure water yielded skinned membranes. Precipitation in water/solvent mixtures with solvent concentration exceeding a certain minimum value (which is different for different systems) resulted in microporous membranes. This phenomenon has been explained in terms of the model description for the formation of asymmetric membranes as adopted in our laboratory. In this model, the skin formation is related to gelation and the formation of the porous substructure to liquid-liquid phase separation. It is made plausible that the addition of solvent to the coagulation bath favours non-solvent inflow and hence liquid—liquid demixing in the precipitating film.

Original language	Undefined
Pages (from-to)	263-274
Journal	Journal of membrane science
Volume	14
Issue number	3
DOIs	https://doi.org/10.1016/0376-7388(83)80005-2
Publication status	Published - 1983

Keywords

IR-67224

Access to Document

10.1016/0376-7388(83)80005-2

mechanism

Cite this

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title = "The mechanism of formation of microporous or skinned membranes produced by immersion precipitation",

abstract = "Cellulose acetate and polysulfone casting solutions were coagulated in water/solvent mixtures with differing solvent content. Precipitation in pure water yielded skinned membranes. Precipitation in water/solvent mixtures with solvent concentration exceeding a certain minimum value (which is different for different systems) resulted in microporous membranes. This phenomenon has been explained in terms of the model description for the formation of asymmetric membranes as adopted in our laboratory. In this model, the skin formation is related to gelation and the formation of the porous substructure to liquid-liquid phase separation. It is made plausible that the addition of solvent to the coagulation bath favours non-solvent inflow and hence liquid—liquid demixing in the precipitating film.",

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TY - JOUR

T1 - The mechanism of formation of microporous or skinned membranes produced by immersion precipitation

AU - Wijmans, J.G.

AU - Baaij, J.P.B.

AU - Smolders, C.A.

PY - 1983

Y1 - 1983

N2 - Cellulose acetate and polysulfone casting solutions were coagulated in water/solvent mixtures with differing solvent content. Precipitation in pure water yielded skinned membranes. Precipitation in water/solvent mixtures with solvent concentration exceeding a certain minimum value (which is different for different systems) resulted in microporous membranes. This phenomenon has been explained in terms of the model description for the formation of asymmetric membranes as adopted in our laboratory. In this model, the skin formation is related to gelation and the formation of the porous substructure to liquid-liquid phase separation. It is made plausible that the addition of solvent to the coagulation bath favours non-solvent inflow and hence liquid—liquid demixing in the precipitating film.

AB - Cellulose acetate and polysulfone casting solutions were coagulated in water/solvent mixtures with differing solvent content. Precipitation in pure water yielded skinned membranes. Precipitation in water/solvent mixtures with solvent concentration exceeding a certain minimum value (which is different for different systems) resulted in microporous membranes. This phenomenon has been explained in terms of the model description for the formation of asymmetric membranes as adopted in our laboratory. In this model, the skin formation is related to gelation and the formation of the porous substructure to liquid-liquid phase separation. It is made plausible that the addition of solvent to the coagulation bath favours non-solvent inflow and hence liquid—liquid demixing in the precipitating film.

KW - IR-67224

U2 - 10.1016/0376-7388(83)80005-2

DO - 10.1016/0376-7388(83)80005-2

M3 - Article

SN - 0376-7388

VL - 14

SP - 263

EP - 274

JO - Journal of membrane science

JF - Journal of membrane science

IS - 3

ER -