STUDYING THE STRUCTURE AND PROPERTIES OF POLYMERIC COMPOSITE MEMBRANES BASED ON VINYLYDENE FLUORIDE AND TETRAFLUOROETHYLENE COPOLYMER AND POLYVINYLYDENE FLUORIDE PRODUCED VIA ELECTROSPINNING

Abstract

In the present article the results of studying the influence of polyvinylidene fluoride content (PVDF) in a mixture with vinylidene fluoride-tetrafluoroethylene copolymer (VDF-TeFE) on the properties of spinning solutions, structure, surface free energy and cocrystallization of polymers in composite membranes – obtained by electrospinning –are presented. It was established that an increase in PVDF content in a mixture with VDF-TeFE leads to an increase in electrical conductivity and a decrease in the viscosity of spinning solutions, a decrease in the diameter of the fibers forming the membrane, and a decrease in the tensile strength and relative elongation. It was shown that, regardless of the PVDF content, all the formed membranes are hydrophobic and have low free energy of the surface. It was established that an increase in the PVDF content leads to disordering of the ferroelectric β-phase, which manifests itself in a decrease in the interplanar spacing and crystallite size, and a decrease in the degree of system crystallinity.