Protic Ion-Crosslinked Polymeric Ionic Liquids Based on Silsesquioxane Oligomers with Different Types of Amine Sites
摘要
A method for the synthesis of protic ion-crosslinked polymeric ionic liquids (PILs), which consists in neutralization of oligosilsesquioxanes (OSS) containing secondary aliphatic amino groups and imidazole heterocycles in an organic framework with telechelic oligoethylene oxide containing terminal sulfonic acid groups, has been developed. The OSS component determines the amorphous structure of OSS-PILs. Changing the degree of neutralization allows to regulate the content of ionic groups and the mechanism of proton movement while maintaining close values of glass transition temperature (~ –27°C) with the reaching of a single-ion proton conductivity of 4.3∙10–4 S/cm at 100°C in the absence of moisture. The OSS-PILs are promising proton-conducting media for electrochemical devices.