Bei der Koagulation von phasenbildenden, unvertraglichen Polymermischungslosungen entstehen durch das Zusatzpolymer bedingte, bemerkenswert hochporose Fallungsstrukturen. Die dargestellten Untersuchungen haben das Ziel, einen moglichen Einflun der Zusatzpolymere auf die Porositat der Fallungsprimarschicht zu erfassen. Anhand von Permeationsuntersuchungen konnte an den auf fester Unterlage hergestellten Flachmembranen im Gegensatz zur Hohlmembran eine erhohte Porositat der Fallungsprimarschicht nachgewiesen werden. Hierfiir wird ein Porenbildungsmechanismus vorgeschlagen.
Characteristics of structurejormation at the coagulation oj'polymer blend solutions. 4. Membranes f r o m phase-,forming incompatible polymer blend solutionsRemarkable highly porous structures are formed by the coagulation of incompatible phase-forming polymer blend solutions. The effect of an added polymer on the porosity of the primary layer is studied. Investigations of the permeability of membranes prepared by different procedures revealed that only in flat membranes prepared on a solid support an elevated porosity of the primary coagulated layer could be observed. A mechanism of pore formation in this special case is suggested.
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