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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

Published on: November 30, 2020

A lignin/castor oil-based polyamide autonomous self-healing composite materials.

Mang Wu¹, Baozhong Cui¹, Huaizhi Liu²

¹Key Laboratory of Micro-Nano Powder and Advanced Energy Materials of Anhui Higher Education Instituts, School of Materials and Environmental Engineering, Chizhou University, Chizhou 247000, China.

International Journal of Biological Macromolecules

|February 19, 2025

Summary

This study introduces a low-cost, bio-based self-healing elastomer by incorporating lignin into castor oil-based polyamide (PBUDA). The resulting material exhibits enhanced toughness and mechanical strength, alongside autonomous self-healing capabilities at room temperature.

Keywords:

Castor oil-based polyamide Hydrogen bonding interactions Lignin Microphase separation structure

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Area of Science:

Materials Science
Polymer Chemistry
Sustainable Materials

Background:

Developing bio-based self-healing elastomers with high toughness and low cost is challenging.
Lignin, a renewable resource, offers potential for material enhancement.
Castor oil-based polyamide (PBUDA) serves as a promising base material.

Purpose of the Study:

To create a cost-effective, bio-based self-healing elastomer.
To enhance the mechanical properties and self-healing ability of PBUDA using lignin.
To explore lignin valorization for advanced material applications.

Main Methods:

Incorporation of lignin into castor oil-based polyamide (PBUDA) via a solution method.
Characterization of the phase separation structure and mechanical properties of the blends.
Evaluation of the autonomous self-healing performance at room temperature.

Main Results:

Uniform dispersion of lignin in PBUDA formed a phase separation structure.
Mechanical strength increased fivefold (22.7 MPa) with 40% lignin addition.
Toughness and Young's modulus increased by four and fourteen times, respectively.
Excellent room-temperature self-healing ability was achieved due to dynamic hydrogen bonds and low glass transition temperature (Tg).

Conclusions:

Lignin incorporation significantly enhances mechanical properties and toughness of PBUDA.
The PBUDA-lignin blends demonstrate effective autonomous self-healing at room temperature.
This research offers a sustainable pathway for lignin valorization and advances self-healing castor oil-based polyamides.