Effect of Structural Heterogeneity of Polikon Mosaic Materials on Their Properties

Abstract

A unique method for producing Polikon cation-anion exchange mosaic materials has been proposed. The materials were prepared by the polycondensation filling of polymer composites and via synthesis and curing of a weakly basic anion exchanger and a strongly acidic sulfonated cation exchanger on the surface and in the structure of a fibrous novolac phenol-formaldehyde matrix. Molecular models that characterize the chemical composition of the developed composites are given. The effect of the composition that facilitates the formation of a material with stable performance characteristics has been studied. The cause-and-effect relationships of the structural, physicochemical, and operational properties of the heterogeneous cationanion-exchange mosaic materials Polikon under thermomechanical action at the stage of polymer matrix curing were investigated. Empirical equations that refine these relationships were obtained. The morphology and internal structure of the test heterogeneous membranes were characterized by scanning electron microscopy and energy-dispersive elemental analysis. The viscoelastic properties of the samples were studied by dynamic thermomechanical analysis.

Mathematical Modeling of Dielectric Permeability and Volt-Ampere Characteristics of a Semiconductor Nanocomposite Conglomerate

“…To establish the optimal modes of the technology for obtaining a nanocomposite with specified properties, data on the VAС of both contacts between conglomerate grains and on the VAС of the material itself are needed [14]. The VAC of contacts between grains can be quite accurately determined experimentally (for example, by photolithography) [15]. The purpose of this work is to determine the electrical characteristics of the resulting semiconductor nanocomposite conglomerate, based on the data on the electrical characteristics of the substances that make up the nanocomposite, depending on the parameters of external influences.…”

Features of Thermomechanical Stability of Anionic–Cation Exchange Matrix “Polikon AC” on Viscose Non-Woven Materials

“…We have previously shown [ 21 , 22 ] the possibility of using a nonwoven material made of viscose fiber to obtain a polymeric composite material “Polikon”, obtained by the method of the polycondensation filling of polymer composites by synthesizing and curing a weakly basic anion exchanger or a strongly acidic sulfonic cation exchanger on the surface and in the structure of a nonwoven material made of viscose fiber. We have developed the techniques and technological parameters of the processes of their preparation and have also assumed the bipolar nature of ion transfer in such membranes.…”

Application of Viscose Nonwoven Fabrics as a Fibrous Frame of Polykon Mosaic Membranes

“…Such membranes are utilized in many electromembrane technologies such as the production of deionized water, conditioning of food products, and the creation of water recirculation systems in chemical industry. A characteristic feature of such membrane structural systems is the possibility to control the ratio of the functions of transport of salt ions and generation of dissociation products by varying the thickness of one of the layers constituting a bipolar membrane [8][9][10][11].…”