TY JOUR TI THERMAL STABILITY AND FLAMMABILITY OF PHOSPHORUS-CONTAINING POLYISOCYANURATE FOAMS KW oxygen index KW char residue KW melamine KW polyisocyanurate foam KW ammonium polyphosphate KW thermal and thermooxidative degradation KW phosphorus-containing flame retardant JO Technique and technology of silicates AU Zolotarev, M.E. AU Naganovsky, Y.K. AU Ushkov, V.A. AU Stenechkina, K.S. AU Toirov, S.H. AU Evtushenko, Y.M. PY 2026 IS 33 PB Individual Entrepreneur Svetlana Vasilievna Samchenko