TY JOUR TI Formation of lignophenol-formaldehyde resins with an average alkali content in the reaction mixture KW lignin-phenol-formaldehyde resin KW sodium lignosulfonate KW physico-chemical analysis of resin KW 13C NMR spectroscopy JO Forestry Engineering Journal AU Glazunova, M.G. PY 2025 IS 15 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov