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<p>Recently, due to environmental concerns, research has been directed to develop water-based adhesives to replace chemically derived toxic, and non-biodegradable traditional adhesives. In the present study, the exopolysaccharide produced by <i>Priestia aryabhattai</i> KAG-18 (EPS/KAG-18) demonstrated adhesiveness, showing potential as an eco-friendly adhesive that can bind various surfaces, including wood, metal, and acrylic. The lap shear strength of the EPS/KAG-18 adhesive bonded teak wood to teak wood, pine wood to pine wood, metal-to-metal, and acrylic-to-acrylic exhibited 6.87 ± 0.68&#xa0;MPa, 5.80 ± 0.96&#xa0;MPa, 34.03 ± 1.37&#xa0;MPa, 0.44 ± 0.09&#xa0;MPa, respectively. At higher EPS/KAG-18 adhesive, teak wood to teak wood joints showed higher shear strength, compared to other specimens. A commercially available polyvinyl acetate (PVA) based adhesive exhibited lap shear strength of 7.87 ± 0.54&#xa0;MPa for teak wood, 6.83 ± 1.57&#xa0;MPa for pine wood, 6.05 ± 2.71&#xa0;MPa for metal, and 0.70 ± 0.25&#xa0;MPa for acrylic. Thermal stability tests using TGA and DSC analyses revealed that the EPS/KAG-18 adhesive remained stable up to 250&#xa0;°C without the presence of a glass transition. FT-IR spectroscopy indicated the presence of hydroxyl and carboxyl groups in EPS/KAG-18 characteristics of polysaccharides. Contact angle measurements indicated a hydrophilic nature on wood and metal surfaces (&lt; 90°) and hydrophobic characteristics on acrylic substrates (&gt; 90°). EPS/KAG-18 (3.0 to 9.0% w/v) solutions showed shear-thinning rheology, G’ &gt; G”, and best fit to the Herschel–Bulkley model applicable for fluids with yield stress. Finite element analysis (FEA) of the EPS/KAG-18 bonded single lap joint of acrylic specimens revealed that the stress was concentrated at the edges of the joint, while minimal stress was observed in the central region. Hence, in the present study, we report for the first time the modelling of rheological behaviour and FEA of adhesive joints along with its adhesive properties.</p>

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Adhesive Potential of Priestia aryabhattai KAG-18 Exopolysaccharide: Surface Bonding, Material Properties, and Finite Element Modeling

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Komal Parmar,
  • Dipal Patel,
  • Bragadish Iyer

摘要

Recently, due to environmental concerns, research has been directed to develop water-based adhesives to replace chemically derived toxic, and non-biodegradable traditional adhesives. In the present study, the exopolysaccharide produced by Priestia aryabhattai KAG-18 (EPS/KAG-18) demonstrated adhesiveness, showing potential as an eco-friendly adhesive that can bind various surfaces, including wood, metal, and acrylic. The lap shear strength of the EPS/KAG-18 adhesive bonded teak wood to teak wood, pine wood to pine wood, metal-to-metal, and acrylic-to-acrylic exhibited 6.87 ± 0.68 MPa, 5.80 ± 0.96 MPa, 34.03 ± 1.37 MPa, 0.44 ± 0.09 MPa, respectively. At higher EPS/KAG-18 adhesive, teak wood to teak wood joints showed higher shear strength, compared to other specimens. A commercially available polyvinyl acetate (PVA) based adhesive exhibited lap shear strength of 7.87 ± 0.54 MPa for teak wood, 6.83 ± 1.57 MPa for pine wood, 6.05 ± 2.71 MPa for metal, and 0.70 ± 0.25 MPa for acrylic. Thermal stability tests using TGA and DSC analyses revealed that the EPS/KAG-18 adhesive remained stable up to 250 °C without the presence of a glass transition. FT-IR spectroscopy indicated the presence of hydroxyl and carboxyl groups in EPS/KAG-18 characteristics of polysaccharides. Contact angle measurements indicated a hydrophilic nature on wood and metal surfaces (< 90°) and hydrophobic characteristics on acrylic substrates (> 90°). EPS/KAG-18 (3.0 to 9.0% w/v) solutions showed shear-thinning rheology, G’ > G”, and best fit to the Herschel–Bulkley model applicable for fluids with yield stress. Finite element analysis (FEA) of the EPS/KAG-18 bonded single lap joint of acrylic specimens revealed that the stress was concentrated at the edges of the joint, while minimal stress was observed in the central region. Hence, in the present study, we report for the first time the modelling of rheological behaviour and FEA of adhesive joints along with its adhesive properties.