 This study introduces a new polymerization technique for creating a highly cross-linked polymer membrane that can be used for selective separation of hydrogen from other gases at high temperatures. This method replaces the conventional aqueous phase with dimethyl sulfoxide slash potassium hydroxide, which allows for the deprotonation of biphenols into aryl oxide anions that react with hexachlorocyclotryphosphazine, dissolved in cyclohexane to create a thin film of a highly cross-linked polymer. These films exhibit excellent selectivity for hydrogen over other gases such as nitrogen or methane, and retain their performance even after being exposed to temperatures up to 450 degrees Celsius. This makes them ideal candidates for use in industrial applications where separation of hydrogen from other gases is required at higher temperatures. This article was authored by Farzana Radminesh, Ernst J., our sed-holter, Alberto Tenna, and others. We are article.tv, links in the description below.