Influence of the Molecular Weight of Polyvinylpyrrolidone on the Physicomechanical Properties of Composite Polyamide Hydrogel Membranes

We establish the regularities of formation of composite polymeric hydrogel membranes based on liquid-structured copolymers of 2-hydroxyethyl methacrylate (HEMA) with polyvinylpyrrolidone (PVP) modified by a thin layer of a mixture of polyamide-6 (PA-6) and PVP by the method of diffusion deposition from a formate solution. We study the physical and mechanical properties of the obtained composite membranes depending on the molecular weight of PVP in the structure of the copolymer and in the modifying mixture, as well as on the degree of adsorption of the PA-6–PVP mixture on the source hydrogels. It is shown that the strength of hydrogel membranes increases with the molecular weight of PVP in the hydrogel matrix structure and with its decrease in the PA-6–PVP formate solution.