TY JOUR TI FEATURES OF USING SECONDARY RAW MATERIALS IN THE POLYMER FILMS PRODUCTION KW polymer materials KW modification KW recycled polymers JO Bulletin of the Angarsk State Technical University AU Genenko, N.I. AU Chernigovskaya, M.A. PY 2023 IS 1 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»