TY JOUR TI ON THE INFLUENCE OF POLYOL COMPOSITION FUNCTIONALITY ON CONCENTRATION GRADIENTS IN POLYURETHANE-POLYISOCYANURATE FOAMS KW POLYURETHANE-POLYISOCYANURATE FOAMS KW CONCENTRATION GRADIENTS KW FUNCTIONALITY KW POLYOL KW ISOCYANURATE KW RESIDUAL ISOCYANATE KW COMPRESSIVE STRENGTH JO Herald of Technological University AU Vlasov, R.R. AU , .. PY 2026 IS 29 PB Kazan National Research Technological University