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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Photothermal-responsive lignin-based polyurethane with mechanically robust, fast self-healing, solid-state plasticity

Xiaochun Liu1, Zhiyi Huang1, Jianxin Wu1

  • 1School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China.

International Journal of Biological Macromolecules
|May 22, 2024
PubMed
Summary

Researchers developed a novel lignin-based polyurethane (DLPU) with photothermal-responsiveness. This sustainable material exhibits remarkable self-healing and shape-shifting properties upon near-infrared irradiation.

Keywords:
LigninPhotothermal-responsivePolyurethane

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Growing concerns over petrochemical resource depletion and environmental pollution necessitate sustainable material alternatives.
  • Lignin, a natural biomass component, offers a promising renewable resource for developing functional materials.

Purpose of the Study:

  • To develop a photothermal-responsive lignin-based polyurethane (DLPU).
  • To impart self-healing and shape-shifting capabilities to the DLPU through controlled bond dynamics.

Main Methods:

  • Incorporation of lignin and oxime-carbamate bonds into a polyurethane network.
  • Utilizing near-infrared (NIR) irradiation to trigger photothermal effects.
  • Characterization of mechanical properties, photothermal conversion efficiency, and responsive behaviors.

Main Results:

  • The DLPU demonstrated excellent mechanical strength (30.2 MPa) and toughness (118.7 MJ·m⁻³).
  • High photothermal conversion efficiency (54.4%) enabled efficient self-healing (96.0% tensile strength recovery) and shape-memory effects (98.8% fixity, 95.3% recovery).
  • NIR irradiation activated reversible dynamics of oxime-carbamate and hydrogen bonds, leading to photocontrolled plasticity and shape-shifting.

Conclusions:

  • The developed DLPU is a multi-functional, responsive material with significant potential for high-value lignin utilization.
  • This research offers a sustainable pathway for creating advanced polyurethanes with tunable self-healing and shape-memory functionalities.