Polymers based on ionic monomers with side phosphonate groups

Abstract

A number of new ionic vinyl monomers composed of 1-vinylimidazolium cation with diethoxy- and dihydroxyphosphoryl groups and various anions—Br−, (CN)2N−, and (CF3SO2)2N−—are synthesized. The free-radical polymerization of the monomers in solutions of molecular and ionic solvents yields new polymer analogs of ionic liquids, and their molecular-mass characteristics, solubility, heat resistance, thermal stability, and electrical conductivity are estimated. It is shown that the incorporation of bulky phosphorylalkyl side substituents into the vinylimidazolium polycation causes a decrease in the glass-transition temperature and an increase in the ionic conductivity of polymer salts. The highest ionic conductivity (2.6 × 10−5 S/cm at 25°C) is exhibited by the polymer with the (CN)2N− anion.