Abstract
The research reported here focuses on developing wood adhesive by mixing liquid glucose (LG) and polyvinyl alcohol (PVA) in water. Here, boric acid is used as a crosslinking agent to improve the LG–PVA blend’s thermomechanical characteristics. The impact of crosslinking was measured using a variety of analytical techniques, including viscosity testing, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and water contact angle testing. By pouring LG–PVA blends onto Teflon sheets, a film was made. On performance parameters like tensile strength, pencil hardness, and thermal properties like glass transition temperature, the impacts of several variables, such as increasing the amount of LG and boric acid, were examined. In the water contact angle test, the crosslinked blend films showed decreased hydrophilic behavior and increased pencil hardness. The films glass transition temperature (Tg) was positively impacted by the higher BA concentration. For the crosslinking reaction with boric acid, the free hydroxyl groups present in LG and PVA serve as an active sites. Crosslinks between the hydroxyl groups of LG and PVA are expected to take place as a trivalent boron attracts these nucleus-loving groups. FTIR spectrum measurements confirmed the interaction of boric acid with the LG–PVA mixture. The reaction was accelerated by the acidic pH, and its effects were shown in the rise in thermomechanical properties. By lowering the free volumes between the chains, the crosslinking improved cohesion, and as a result, an increase in strength on glued wood specimens was observed.
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We would like to thank Institute of Chemical Technology, Mumbai, India, for the support throughout this work.
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Dhawale, P., Gadhave, S. & Gadhave, R.V. Boric acid-crosslinked liquid glucose–polyvinyl alcohol blend-based wood adhesive. Polym. Bull. (2024). https://doi.org/10.1007/s00289-024-05219-8
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DOI: https://doi.org/10.1007/s00289-024-05219-8