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<p>The growing depletion of fossil resources and environmental concerns necessitate the development of high-performance, sustainable adhesives. This study hypothesises that biopolyols derived from the liquefaction of <i>Prosopis juliflora</i> bark, an invasive lignocellulosic species, can serve as adequate substitutes for petroleum-based polyols in polyurethane adhesive formulations. The bark was liquefied using the solvolytic method, yielding a 98.4% yield. The obtained biopolyol exhibited a high hydroxyl value of 309&#xa0;mg KOH/g and an acid number of 17&#xa0;mg KOH/g. Seven polyurethane adhesive formulations were developed using varying ratios of biopolyol without the need for a catalyst. The functional group and structural analyses were performed using Fourier Transform Infrared Spectroscopy (FTIR) and ¹H and ¹³C Nuclear Magnetic Resonance (NMR) spectroscopy. The thermal analysis of biopolyol and adhesives was performed using thermogravimetric analysis and Differential Scanning Calorimetry, which shows thermal stability and glass transition temperature (Tg). The developed bio-based adhesive exhibited a tensile strength of 15.07 ± 4.18&#xa0;MPa, which is significantly higher than the reported values for conventional petroleum-based adhesives (1-5.5&#xa0;MPa), and it also maintained the highest bond strength (9.76 ± 0.26&#xa0;MPa) even after water exposure during the durability test. The hydrophilic and hydrophobic nature of all adhesive variations was determined by contact angle analysis. These findings demonstrate that <i>Prosopis juliflora</i> bark polyols can yield high-performance polyurethane adhesives, offering a dual benefit of sustainable material development and ecological mitigation.</p>

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Valorization of Prosopis juliflora Bark for high-strength biobased polyurethane adhesives: confirming the potential of liquefied lignocellulosic polyols

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Varshini Madhavadhas Padmalakshmi,
  • Sankar G

摘要

The growing depletion of fossil resources and environmental concerns necessitate the development of high-performance, sustainable adhesives. This study hypothesises that biopolyols derived from the liquefaction of Prosopis juliflora bark, an invasive lignocellulosic species, can serve as adequate substitutes for petroleum-based polyols in polyurethane adhesive formulations. The bark was liquefied using the solvolytic method, yielding a 98.4% yield. The obtained biopolyol exhibited a high hydroxyl value of 309 mg KOH/g and an acid number of 17 mg KOH/g. Seven polyurethane adhesive formulations were developed using varying ratios of biopolyol without the need for a catalyst. The functional group and structural analyses were performed using Fourier Transform Infrared Spectroscopy (FTIR) and ¹H and ¹³C Nuclear Magnetic Resonance (NMR) spectroscopy. The thermal analysis of biopolyol and adhesives was performed using thermogravimetric analysis and Differential Scanning Calorimetry, which shows thermal stability and glass transition temperature (Tg). The developed bio-based adhesive exhibited a tensile strength of 15.07 ± 4.18 MPa, which is significantly higher than the reported values for conventional petroleum-based adhesives (1-5.5 MPa), and it also maintained the highest bond strength (9.76 ± 0.26 MPa) even after water exposure during the durability test. The hydrophilic and hydrophobic nature of all adhesive variations was determined by contact angle analysis. These findings demonstrate that Prosopis juliflora bark polyols can yield high-performance polyurethane adhesives, offering a dual benefit of sustainable material development and ecological mitigation.