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Bio-Based Healable 2K PU Textile Coating for Durable Applications.

David De Smet1, Myriam Vanneste1

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|October 14, 2022
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A novel biobased polyurethane coating with a Schiff base exhibits excellent self-healing properties on textiles. This advanced material demonstrates significant recovery from damage, restoring its protective functions through dual-dynamic bonds.

Keywords:
bio-basedcoatinghealingpolyurethane (PU)textile

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Textile Finishing

Background:

  • Polyurethane (PU) coatings are widely used for textile applications due to their durability and versatility.
  • Developing sustainable and healable coatings is crucial for extending product lifespan and reducing environmental impact.
  • Schiff base chemistry offers potential for creating dynamic and reversible polymer networks.

Purpose of the Study:

  • To synthesize a biobased, healable 2K polyurethane (PU) coating incorporating a Schiff base for textile applications.
  • To investigate the self-healing capabilities of the developed PU coating under thermal stimuli.
  • To elucidate the role of dual-dynamic imine and disulfide bonds in the healing mechanism.

Main Methods:

  • Synthesis of a Schiff base from cystine and vanillin, containing reversible imine and disulfide bonds.
  • Incorporation of the Schiff base as a chain extender in a 2K polyurethane formulation.
  • Application of the PU coating onto textile substrates.
  • Characterization using FT-IR and SEM.
  • Evaluation of healing efficiency through mechanical testing (scratch repair) and hydrostatic pressure resistance tests.

Main Results:

  • Successful incorporation of the Schiff base into the PU backbone confirmed by FT-IR analysis.
  • The biobased PU coating demonstrated significant self-healing properties upon thermal stimulation (90 °C).
  • A 75% recovery in mechanical integrity after a 2 N scratch and complete restoration of hydrostatic pressure resistance were achieved.
  • SEM analysis confirmed complete scratch closure after 30 minutes of heat treatment.
  • The synergistic action of dual-dynamic imine and disulfide bond metathesis was identified as the healing mechanism.

Conclusions:

  • A novel biobased healable 2K PU coating utilizing a Schiff base has been successfully developed for textiles.
  • The coating exhibits remarkable self-healing capabilities, attributed to the dynamic nature of imine and disulfide bonds.
  • This material offers a sustainable solution for enhancing the durability and longevity of textile products.