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High lignin, light-driven shape memory polymers with excellent mechanical performance.

Xin Jin1, Xuan Liu2, Xiaowen Li2

  • 1Key Laboratory of Bio-based Material Science & Technology, Northeast Forestry University, Ministry of Education, Harbin 150040, PR China; College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China.

International Journal of Biological Macromolecules
|July 29, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed light-driven lignin-based shape memory polymers (ELEPs) using abundant natural lignin. These advanced materials offer enhanced mechanical properties and rapid shape recovery under solar irradiation, paving the way for sustainable intelligent materials.

Keywords:
Enzymatically hydrolyzed ligninLight-drivenShape memory polymer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Renewable Energy

Background:

  • Growing demand for sustainable alternatives to fossil fuels.
  • Lignin as an abundant, natural source of aromatic compounds.
  • Need for advanced materials with shape memory properties.

Purpose of the Study:

  • To develop novel light-driven lignin-based shape memory polymers (ELEPs).
  • To utilize lignin's unique properties for high-value material applications.
  • To create intelligent materials with enhanced mechanical and photothermal characteristics.

Main Methods:

  • Copolymerization of enzymatically hydrolyzed lignin (EL), epoxy soybean oil (ESO), and polyethylene glycol (PEG 400).
  • Curing the mixture to form a disordered three-dimensional polymer network.
  • Testing mechanical properties (tensile strength, glass transition temperature) and shape memory performance under simulated solar irradiation.

Main Results:

  • Increased EL content (40-60 wt%) improved tensile strength (11.3 to 30.8 MPa) and glass transition temperature (93 to 115.7 °C).
  • ELEP50 achieved a surface temperature of 105 °C and shape memory in 20 s under 2000 W m⁻² solar irradiation.
  • Demonstrated stable shape fixation (>98%) and recovery (>97%) over eight cycles.

Conclusions:

  • Light-driven lignin-based shape memory polymers (ELEPs) exhibit excellent mechanical and rapid shape memory properties.
  • This work provides a high-value utilization pathway for lignin and a new design strategy for intelligent materials.
  • ELEPs offer a sustainable alternative for applications requiring responsive and durable materials.