Ecofriendly wood adhesives from date palm fronds lignin for plywood

Utilization of lignin phenol glyoxal (LPG) resins was studied as a potential alternative for formaldehyde (PF) resins. Lignin extracted by alkaline pulping processes (kraft and soda) from date palm fronds (DPF) used an in LPG The isolated samples were characterized using complementary analyses that included Fourier transform infrared (FTIR) spectroscopy, 13C nuclear magnetic resonance (NMR) thermal stability, thermogravi-metric analysis (TGA), differential scanning calorimetry (DSC). Kraft (KLPG) soda (SLPG) also terms solid content, viscosity, gel time. Finally, physico-mechanical tests performed on plywood panels treated with different molar ratios results revealed 50% (w/w) KLPG resin resulted higher tensile strength (65.3 MPa) than PF (58.57 MPa), which potentially attributed to the amount phenolic groups compared lignin. Therefore, substitution DPF enhanced adhesive its chemical mechanical properties, enabling it produce more environmentally friendly wood adhesive.