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Fire Resistant Adhesive from Chitosan.

Dallin L Smith1, Danixa Rodriguez-Melendez1, Maya D Montemayor1

  • 1Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States.

Biomacromolecules
|January 6, 2025
PubMed
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This summary is machine-generated.

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This study presents a novel, low-cost, and nontoxic chitosan-based adhesive for wood applications. The biobased adhesive offers excellent fire protection and strong adhesion, making it an appealing sustainable alternative.

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biotechnology

Background:

  • Chitosan, a globally abundant biopolymer, offers a non-toxic alternative for various industrial applications.
  • Chitosan's solubility is limited in neutral/alkaline conditions but enhanced in weak acids like acetic and citric acid.
  • Formaldehyde-based resins in engineered wood pose environmental and health concerns.

Purpose of the Study:

  • To develop a low-cost, non-toxic, and biobased adhesive from chitosan for wood applications.
  • To evaluate the adhesive and fire-retardant properties of chitosan-acid mixtures.
  • To investigate the effect of pentaerythritol as an additive for enhanced performance.

Main Methods:

  • Chitosan-acid mixtures (acetic acid, citric acid) were prepared and characterized as wood adhesives.

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  • Pentaerythritol was incorporated as a potential plasticizer and flame retardant.
  • Moderate thermal treatment was applied to promote covalent bonding and improve water resistance.
  • Tensile shear strength tests were conducted on lap joints to assess adhesive performance.

    • Main Results:

    • Chitosan-acid mixtures demonstrated effective adhesion to natural wood.
    • The developed adhesives provided fire protection by forming a char barrier.
    • Tensile shear strengths exceeding 1 MPa were achieved on lap joints.
    • Thermal treatment enhanced water resistance through covalent bond formation.

    Conclusions:

    • Chitosan-acid systems offer a cost-effective, non-toxic, and biobased alternative to formaldehyde resins for wood adhesives.
    • The combination of adhesive and fire-retardant properties makes these systems highly attractive for sustainable wood products.
    • Further research into covalent bonding mechanisms and additive optimization can enhance performance.