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Lignin-based non-isocyanate polyurethanes: paving the way for sustainable polymer innovation
A new review highlights advancements in the synthesis of lignin-based non-isocyanate polyurethanes, offering solutions to the environmental and health challenges posed by conventional polyurethane production.
Polyurethanes (PUs) are among the most widely used polymers in industries ranging from automotive to construction due to their versatile properties. However, the conventional synthesis of PUs relies heavily on toxic isocyanates and petroleum-based diols, raising significant environmental and health concerns. Recycling challenges further exacerbate the issues surrounding these materials.
To address these challenges, researchers have turned to non-isocyanate polyurethanes (NIPUs) as a safer and more sustainable alternative. A recent review explores the use of lignin, the second most abundant biopolymer globally, as a key raw material for producing bio-based NIPUs. Lignin’s rigidity and functional versatility make it particularly suitable for designing polyurethanes with tailored mechanical and chemical properties.
Reading tip: Polyurethane
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Advances in greener processes and sustainable precursors
The review provides a comprehensive overview of alternative synthetic routes for NIPUs, focusing on isocyanate-free methods that reduce toxicity. Special attention is given to lignin-based non-isocyanate polyurethanes (LNIPUs), which utilise renewable resources and greener processes to enhance sustainability.
Recent research efforts have demonstrated the potential of lignin-derived polymers to replace traditional toxic precursors while maintaining high performance standards. These innovations represent a critical step towards the widespread adoption of environmentally friendly polyurethane systems.
Source: Karoki, P. K. et al., Lignin-based non-isocyanate polyurethanes: towards sustainable polyurethanes. Green Chemistry, Issue 2026.
