RHEOLOGICAL PROPERTIES AND STRUCTURATION OF SOLUTIONS OF ACRYLONITRILE COPOLYMERS USED FOR THE PREPARATION OF MEMBRANES

Rheological properties of solutions of acrylonitrile copolymers used f or the preparation of membranes were studied. Thermodynamic parameters for the viscous flow of these solutions were calculated. The dimensio ns and concentration of supermolecular particles were determined by me asuring the turbidity spectra of solutions. No explicit correlation be tween the theological properties of solutions and the performance of m embranes prepared from those solutions was observed, Formation of high ly permeable porous structures as a result of phase separation of the solutions of acrylonitrile copolymers and cellulose acetate was relate d to the existence in these solutions of supermolecular particles whos e size is commensurable with the pore size of ultrafiltration membrane s.