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Lignin-based non-isocyanate polyurethanes by transurethanisation: catalyst selection towards covalent adaptable networks
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DOI：10.1039/D6PY00044D.png)
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Abstract
En 中文
This work reports the synthesis of lignin-based non-isocyanate polyurethanes (NIPUs) via transurethanisation (TU); aiming to develop biobased and recyclable covalent adaptable networks (CANs). A kinetic study of a model TU reaction enabled the selection of four catalysts for the preparation of crosslinked NIPUs from a Kraft lignin-derived polyol and hexamethylene dicarbamate. All these aromatic materials exhibited dynamic covalent behavior; allowing stress relaxation and efficient recycling through multiple thermomechanical cycles. The catalyst choice significantly influenced network architecture; mechanical performance; and recyclability. Iron and bismuth/zinc catalysts emerged as promising non-toxic alternatives to conventional tin-based catalysts; promoting efficient TU while limiting side reactions such as urea formation; which otherwise can compromise reprocessability. Chemical recycling was also demonstrated as a potential option for end-of-life valorization. Indeed; TU emerges as a robust and versatile framework for the synthesis of biobased and circular NIPUs. This approach clearly emphasizes how strategic catalyst selection is fundamental to tailoring material properties and ensuring recyclability.
Keywords:
lignin-based polyurethanes
non-isocyanate polyurethanes
transurethanisation
covalent adaptable networks
catalyst selection