Improving Sustainability through Covalent Adaptable Networks in the Recycling of Polyurethane Plastics

Author:

Miravalle Edoardo1ORCID,Bracco Pierangiola12ORCID,Brunella Valentina12ORCID,Barolo Claudia123ORCID,Zanetti Marco123ORCID

Affiliation:

1. Department of Chemistry, NIS Interdepartmental Centre, University of Turin, Via P. Giuria 7, 10125 Turin, Italy

2. INSTM Reference Centre, University of Turin, Via G. Quarello 15A, 10135 Turin, Italy

3. ICxT Interdepartmental Centre, University of Turin, Via Lungo Dora Siena 100, 10153 Turin, Italy

Abstract

The global plastic waste problem has created an urgent need for the development of more sustainable materials and recycling processes. Polyurethane (PU) plastics, which represent 5.5% of globally produced plastics, are particularly challenging to recycle owing to their crosslinked structure. Covalent adaptable networks (CANs) based on dynamic covalent bonds have emerged as a promising solution for recycling PU waste. CANs enable the production of thermoset polymers that can be recycled using methods that are traditionally reserved for thermoplastic polymers. Reprocessing using hot-pressing techniques, in particular, proved to be more suited for the class of polyurethanes, allowing for the efficient recycling of PU materials. This Review paper explores the potential of CANs for improving the sustainability of PU recycling processes by examining different types of PU-CANs, bond types, and fillers that can be used to optimise the recycling efficiency. The paper concludes that further research is needed to develop more cost-effective and industrial-friendly techniques for recycling PU-CANs, as they can significantly contribute to sustainable development by creating recyclable thermoset polymers.

Publisher

MDPI AG

Subject

Polymers and Plastics,General Chemistry

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