Odor-free kraft lignin-based thermoset with remarkable mechanical properties

Alexander Orebom ¹, Aditya Babu ², Zoya Zarafshani ²

⁰Lignicore AB, Rapsgatan 25, 75450, Uppsala, Sweden. pierre.munier@lignicore.se.

Faraday Discussions +

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September 18, 2025

View abstract on PubMed

Summary

Future materials from Kraft lignin (a renewable resource) offer enhanced mechanical properties and sustainability. This new lignin-based resin, LigniSet®, is recyclable and environmentally beneficial compared to burning the byproduct.

Area Of Science

Materials Science
Sustainable Chemistry
Polymer Science

Background

Developing sustainable materials from renewable resources is crucial.
Kraft lignin, a paper industry byproduct, is abundant but underutilized.
Existing lignin-based materials often compromise mechanical properties or require complex processing.

Purpose Of The Study

To create a high-performance, sustainable resin from Kraft lignin.
To enhance mechanical properties of lignin-based thermosets.
To explore the compatibility and recyclability of the new material.

Main Methods

Combining Kraft lignin with bio-based glycerol 1,3-diglycidyl ether.
Characterizing the resulting resin (LigniSet®) for properties and performance.
Evaluating composite formation with natural fibers.
Assessing recyclability and environmental impact via life cycle assessment.

Main Results

A novel, odorless Kraft lignin-based thermoset resin (LigniSet®) was successfully synthesized.
The resin exhibits enhanced mechanical properties.
LigniSet® demonstrates excellent compatibility with natural fibers for composite applications.
The material is recyclable without performance loss.
Life cycle assessment confirms significant environmental benefits over burning lignin.

Conclusions

Kraft lignin can be transformed into high-value, sustainable thermoset materials.
LigniSet® offers a promising eco-friendly alternative to conventional materials.
Utilizing lignin for material production significantly improves environmental sustainability.