This work deals with obtaining of asymmetric membranes by phase invers
ion method, induced by a chemical reaction. The investigations were ca
rried out on a polymer-solvent-nonsolvent system with polyamide-6 as p
olymer, formic acid as solvent and aqueous base solutions (NaOH, NH3)
as nonsolvents. The following variants of chemical reactions which ind
uce phase inversion were studied : decomposition of the solvent in non
solvent, reaction between the solvent and nonsolvent and also that bet
ween a nucleophillic reactant from the nonsolvent with solvent. The ch
emical reactions influenced the morphology of the membranes obtained i
n this study, as evidenced bg scanning electron microscopy.