Abstract
In this research work, vinyl acetate (VAc) and glycidyl methacrylate (GMA) emulsion copolymers have been developed and tested as wood adhesives. Further, the emulsion samples are formulated with polyvinyl alcohol (PVA) solution, plasticizer, and preservatives, and compared the polyvinyl acetate (PVAc) homo-polymer based adhesive against PVAc-GMA based adhesive sample. Utilizing differential scanning calorimetry (DSC), the glass transition temperatures (Tg) of the polymer films were found. To assess the effectiveness of the adhesives, the tensile shear strength of wood joints under dry and wet conditions was evaluated in compliance with the EN 204 and EN 205 standard. The heat resistance of the wood adhesives was assessed using the EN 14257 standard, which measures the shear stress of wood joints at 80 °C. According to the experimental findings, the amount of GMA in the emulsion caused significant increases in Tg and hardness. The results of DSC, which were confirmed by tests on the hardness of films, showed that the Tg in the GMA-based adhesive was significantly higher than in the PVAc homo-polymer-based adhesive. According to EN 204, the tensile shear strength of a GMA-based adhesive increased by 43.62% after 6 h of bonding in a dry environment and by 75% in a wet environment when compared to a PVAc homopolymer-based adhesive. Comparing the GMA adhesive to a PVAc homopolymer-based glue, the GMA adhesive demonstrated better heat resistance. The technique developed provides a straightforward and useful path to adhesives with better heat, water, and bonding strength resistance.
Published Version
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