Changes in morphology, physical and chemical properties of the polyacrylonitrile membranes selective layer after modification by polyelectrolyte solutions

Abstract

It is important for obtaining of the composite nanofiltration structures to choose an optimal initial membrane matrix for formation of the tight selective layer by means of the interfacial polycondensation reaction. In this work we studied changes in the morphology, physical and chemical properties of the ultrafiltration membranes made of various acrylonitrile copolymers after applying of dilute polyelectrolyte solutions as modification agents. This modification method can be used both as for obtaining of tight ultrafiltration membranes (MWCO = 1–5 kDa) and as an intermediate stage in the production of composite nanofiltration membranes.