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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

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Lignin-reinforced photothermal polyurethane elastomers with tunable mechanics, shape memory, and antibacterial

Wanhui Wu¹, Chao Deng², Xinxi Han¹

¹Key Laboratory of Food Quality and Safety of Guangdong Province, College of Food Science, South China Agricultural University, Guangzhou, 510642, China.

International Journal of Biological Macromolecules

|April 22, 2026

Summary

This study introduces high-performance polyurethane elastomers (MEPU) using lignin derivatives for enhanced mechanical and photothermal properties. These bio-based materials offer tunable functions like shape memory and antibacterial activity triggered by near-infrared light.

Keywords:

Elastomer Lignin Photothermal conversion Polyurethane

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Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

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Published on: January 8, 2016

Area of Science:

Materials Science
Polymer Chemistry
Biomaterials

Background:

Balancing mechanical properties and multifunctionality in polyurethane elastomers is challenging.
Lignin, a bio-based polymer, offers potential for developing sustainable materials.
Developing high-performance, multifunctional elastomers from renewable resources is crucial.

Purpose of the Study:

To develop a sustainable strategy for fabricating high-performance polyurethane elastomers (MEPU) using lignin derivatives.
To integrate chemically modified lignin (MLOH) and enzymatic lignin (EL) to enhance mechanical and photothermal properties.
To explore the tunable photothermal conversion and mechanical performance of MEPU by adjusting the MLOH/EL ratio.

Main Methods:

Fabrication of MEPU by integrating MLOH (reactive crosslinker) and EL (physical crosslinker).
Characterization of mechanical properties (tensile strength, elongation at break, toughness).
Evaluation of photothermal conversion efficiency and NIR-triggered functionalities (shape memory, self-healing, antibacterial activity).

Main Results:

MEPU exhibited tunable photothermal conversion and mechanical performance based on the MLOH/EL ratio.
Optimal formulation M5E5PU showed exceptional mechanical properties (tensile strength 37.8 MPa, elongation at break 795.5%) and photothermal conversion (101.8°C).
M5E5PU demonstrated NIR-triggered shape memory, fatigue resistance, self-healing, and complete antibacterial activity within minutes.

Conclusions:

This work presents a novel platform for developing multifunctional, bio-based photothermal elastomers.
The developed MEPU offers a sustainable approach for high-value utilization of lignin.
The tunable properties and functionalities make MEPU suitable for various advanced applications.