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<p>Wood adhesives are mostly made of petroleum-derived polymers, however bio-based polymers are being used to reduce dependency on non-renewable resources. This study investigates the creation of bioadhesives based on guar gum (GG) and polyvinyl alcohol (PVA) for use as wood adhesives. However, the usefulness of bio-based polymers is limited since they frequently lack heat and water resistance. Boric acid is used as a crosslinking agent to improve the GG-PVA mix’s thermomechanical qualities in order to address this. The impact of crosslinking is assessed analytically using methods such as water contact angle measurement, Fourier transform infrared spectroscopy (FTIR), and viscosity study. The impact of GG and boric acid concentrations was evaluated using performance measures, such as pencil hardness and tensile strength in both wet and dry circumstances, after GG-PVA films were formed onto Teflon sheets. Crosslinking resulted in decreased hydrophilicity and increased pencil hardness. The unbound hydroxyl groups in PVA and GG served as active locations for boric acid crosslinking, creating a network that made the films stronger. Boric acid and the GG-PVA combination were shown to interact, according to FTIR measurement; an acidic pH accelerated these reactions and improved thermomechanical characteristics. By decreasing the open volume between polymer chains, crosslinking increased cohesion and strengthened the wood bond.</p>

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Wood adhesive based on a blend of polyvinyl alcohol and guar gum cross-linked with boric acid

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Ravindra V. Gadhave,
  • Prajyot Dhawale

摘要

Wood adhesives are mostly made of petroleum-derived polymers, however bio-based polymers are being used to reduce dependency on non-renewable resources. This study investigates the creation of bioadhesives based on guar gum (GG) and polyvinyl alcohol (PVA) for use as wood adhesives. However, the usefulness of bio-based polymers is limited since they frequently lack heat and water resistance. Boric acid is used as a crosslinking agent to improve the GG-PVA mix’s thermomechanical qualities in order to address this. The impact of crosslinking is assessed analytically using methods such as water contact angle measurement, Fourier transform infrared spectroscopy (FTIR), and viscosity study. The impact of GG and boric acid concentrations was evaluated using performance measures, such as pencil hardness and tensile strength in both wet and dry circumstances, after GG-PVA films were formed onto Teflon sheets. Crosslinking resulted in decreased hydrophilicity and increased pencil hardness. The unbound hydroxyl groups in PVA and GG served as active locations for boric acid crosslinking, creating a network that made the films stronger. Boric acid and the GG-PVA combination were shown to interact, according to FTIR measurement; an acidic pH accelerated these reactions and improved thermomechanical characteristics. By decreasing the open volume between polymer chains, crosslinking increased cohesion and strengthened the wood bond.