AbstractThe 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 oth
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