INFLUENCE OF INITIAL STATES ON THE ELECTROCHEMICAL BEHAVIOR OF INDUSTRIAL IONITES IN THE INTERPOLYMER SYSTEM LEVATITE CNPLF – АВ-17-8

Abstract

The electrochemical behavior of macromolecules of commercial CNPLF and AB-17-8 ion exchangers under various initial states was analyzed by the methods of electrical conductivity and pH-meters. When considering ion exchangers in swollen states, with an increase in the ratio from cation exchanger to anion exchanger, significant changes are observed. The highest values of electrical conductivity are observed at 5:1 and 0:6, where at 5:1 the electrical conductivity of interpolymer systems is 2.5 times greater than at the minimum point at 5:1 (lewatit:anion exchanger), and about 2.0 times greater at 0:6 respectively. Due to the weak dissociation of H₂O, the equilibrium will shift to the right. According to the Le Chatelier principle, additional H⁺ ions appear in the aquatic environment, the concentration of which increases to a ratio of 5:1. In the case of Lewatit˂AB-17-8, another equilibrium sets in, in which OH^-groups are spent to neutralize H⁺ ions. To restore the concentration of OH^- ions, the anion exchanger AV-17-8 additionally dissociates. The transition region at a ratio of 2:4 indicates that AB-17-8 is a stronger polyelectrolyte than lewatit. The minimum values are reflected in the equimolar state 3:3 (cation exchanger:anion exchanger). The difference between the minimum and maximum values reaches significant values. For example, at 0.08 hours, the χ value increases from 2 to 7, which is a 3.5-fold increase in electrical conductivity. The maximum electrical conductivity for the system CNPLF_dry - AV-17-8_sw is observed at a ratio of cation exchanger:anion exchanger 5:1. The minimum points are at ratios of 4:2 and 2:4. A distinctive feature of this system is the large difference between the maximum and minimum values, the values of which are higher than in the case of CNPLF_sw - АВ-17-8_sw. In the CNPLF_sw - АВ-17-8_dry system, the maximum areas were established at ratios of 3:3 and 2:4. The values ​​of the maximum electrical conductivity are observed during the interaction of 30 hours. Minimal χ is observed at 0.08 hours.

Thus, the obtained experimental results on χ and pH measurements for interpolymer systems consisting of dry and swollen ion exchangers indicate that changes in the initial state of one of the components significantly change the electrochemical behavior of ion exchangers and interpolymer systems, which affects the applied properties of industrial ion exchangers.