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Phase separation phenomena during the formation of asymmetric membranes
Author(s) -
Koenhen D. M.,
Mulder M. H. V.,
Smolders C. A.
Publication year - 1977
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1977.070210118
Subject(s) - membrane , polystyrene , nucleation , crystallization , chemical engineering , polymer chemistry , materials science , phase (matter) , dimethylformamide , chemistry , solvent , polymer , organic chemistry , composite material , biochemistry , engineering
The formation of membranes from two systems has been studied. In the system polyurethane–dimethylformamide–water, the mechanism for the formation of the sponge‐like structure proves to be a liquid–liquid phase separation with nucleation and growth of the diluted phase. This mechanism has been confirmed for the system modified polystyrene–polyisoprene–polystyrene/ o ‐dichlorobenzene/(methanol–water). Crystallization and gelation is discussed. The membranes prepared showed hyperfiltration activity. The mechanism proposed here is believed to be valid for other systems, too.