TY JOUR TI FORMATION OF NEW PROTON-EXCHANGE POLYMER MEMBRANES IN THE STYRENE SULFONIC ACID/4-VINYLPYRIDINE SYSTEM KW styrene sulfonic acid KW 4-vinylpyridine KW proton exchange polymer membrane KW specific conductivi-ty KW ion exchange capacity KW water absorption JO Bulletin of the Angarsk State Technical University AU Raskulova, T.V. AU Malahova, E.A. PY 2025 IS 1 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»