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<p>With increasing environmental concerns over synthetic adhesives, there is a growing demand for sustainable, bio-based alternatives derived from renewable resources. This study focuses on developing an eco-friendly adhesive based on agro-waste biomass-derived starch, reinforced with natural montmorillonite clay as the filler and Sorbitol as plasticizer. The effects of varying filler (3%, 6%, and 9%) and Sorbitol as plasticizer (3–21%) concentrations on key physico-chemical and mechanical properties were systematically investigated. Viscosity increased significantly with temperature, peaking at 75&#xa0;°C. Moisture uptake showed an inverse relationship with filler content, while solubility decreased with higher clay concentrations but improved with increasing Sorbitol levels. Mechanical testing revealed a maximum shear strength of 4.720 ± 0.02&#xa0;MPa at 6% filler and 14% plasticizer, with a minor decline under wet conditions. Tensile strength progressively increased with Sorbitol concentration, reaching optimal performance at 14% plasticizer and 6% filler. Thermal analyses (TGA and DSC) confirmed that filler and plasticizer composition modulate thermal stability and glass transition temperature. These findings demonstrate the potential of dextrin starch-based adhesives, reinforced with montmorillonite and plasticized with Sorbitol, as sustainable and effective alternatives for industrial adhesive applications.</p> Graphical abstract <p></p>

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Synthesis and characterization of ecofriendly biobased adhesives from renewable agrowaste starch

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月6日

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  • Asmare Tezera Admase,
  • Bereded Gedamu Eshetie,
  • Desalegn Adisu Kassie,
  • Ejigayehu Desalegn Asrade

摘要

With increasing environmental concerns over synthetic adhesives, there is a growing demand for sustainable, bio-based alternatives derived from renewable resources. This study focuses on developing an eco-friendly adhesive based on agro-waste biomass-derived starch, reinforced with natural montmorillonite clay as the filler and Sorbitol as plasticizer. The effects of varying filler (3%, 6%, and 9%) and Sorbitol as plasticizer (3–21%) concentrations on key physico-chemical and mechanical properties were systematically investigated. Viscosity increased significantly with temperature, peaking at 75 °C. Moisture uptake showed an inverse relationship with filler content, while solubility decreased with higher clay concentrations but improved with increasing Sorbitol levels. Mechanical testing revealed a maximum shear strength of 4.720 ± 0.02 MPa at 6% filler and 14% plasticizer, with a minor decline under wet conditions. Tensile strength progressively increased with Sorbitol concentration, reaching optimal performance at 14% plasticizer and 6% filler. Thermal analyses (TGA and DSC) confirmed that filler and plasticizer composition modulate thermal stability and glass transition temperature. These findings demonstrate the potential of dextrin starch-based adhesives, reinforced with montmorillonite and plasticized with Sorbitol, as sustainable and effective alternatives for industrial adhesive applications.

Graphical abstract