Abstract
Moisture-resistant environmentally friendly starch-stabilized adhesive joints are obtained by modifying starch-stabilized polyvinyl acetate (PVAc) dispersion with special compounds like reactive N-methylol acrylamide (NMA) co-monomer. Here, the effect of the addition of NMA co-monomer in starch-stabilized PVAc-based wood adhesives on water resistance and heat stability were studied. The copolymers are then formulated with a polyvinyl alcohol (PVA) solution, plasticizer, and preservatives. Compared with the traditional water-resistant wood adhesive, the water resistance of starch-stabilized PVAc-NMA emulsion polymer-based adhesive was similar like PVA stabilized PVAc-NMA emulsion-based adhesive. Glass transition temperatures and cross-linking behaviour of the polymer films were analysed using differential scanning calorimetry (DSC). DSC results showed a substantial increase in Tg, with the addition of starch in the copolymer emulsion which is also confirmed in film hardness testing. The cross-linking reaction between the amide group in the copolymer chains and the reaction between aluminium chloride with the hydroxyl group of starch and PVA results in a cross-linked structure and occurs rapidly at ambient temperature which is analysed through Fourier transform infrared. The performance of this starch-stabilized PVAc-NMA-based wood adhesive was evaluated in accordance with the EN 204–205 D3 standard by measuring the shear stress of wood joints underwater. The cross-linked adhesive with starch showed superior water resistance, mechanical properties, and stability, unlike PVA stabilized cross-linked wood adhesives.
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Gadhave, R.V. Synthesis and characterization of starch-stabilized polyvinyl acetate-N-methylol acrylamide polymer-based wood adhesive. J Indian Acad Wood Sci 20, 51–61 (2023). https://doi.org/10.1007/s13196-023-00312-3
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DOI: https://doi.org/10.1007/s13196-023-00312-3