Self-reforming plastic breaks down at 90 °C, then reassembles

UK researchers developed a plastic that decomposes into gas at 90 °C and reforms at room temperature. A breakthrough paving the way for easier-to-recycle materials without heavy chemical processes.

A polymer that goes from solid to gas, then back again

The University of Surrey team synthesized a novel polymer, poly(1,2-dithiolane), capable of decomposing into vapor at relatively low temperatures (around 90 °C), then naturally reassembling once cooled. Unlike conventional plastics, which require temperatures near 200 °C to begin degrading, this material skips the liquid phase and transitions directly from solid to gas.

This property also allows dyes embedded in the plastic to be removed in a single heating step. Currently, eliminating these additives from plastic waste requires additional, costly, and energy-intensive chemical treatments.

A step forward for a circular economy, but not a miracle solution

Peter Roth, a chemical engineer at the University of Surrey, emphasizes that this plastic is not a substitute for conventional materials, nor a solution to the global waste problem. It is rather a proof of concept: "We have demonstrated that it is possible to create a material with very different behavior, capable of transforming into vapor at relatively low temperatures before reassembling to form the same polymer."

"This is not a substitute for conventional plastics, and it is certainly not a solution to the global plastic waste problem. But it introduces a new concept that could inspire an entirely new generation of circular materials." — Peter Roth, chemical engineer at the University of SurreyTranslated from French

Touseef Kazmi, lead author of the study published in Macromolecules, adds: "If we can master this chemistry, it could eventually lead to new materials that are easier to apply, remove, and recycle than many of today’s plastics."

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Plastic pollution remains a critical issue

Humanity produces over 400 million tonnes of plastic every year, according to the 2024 report by the United Nations Environment Programme (UNEP). A large portion ends up in nature, with harmful consequences for the environment and human health.

This innovative polymer alone won’t solve the plastic waste crisis, but it shows that another path is possible. The next step will be to validate its scalability to industrial levels and its integration into practical applications.

GEO — Un plastique qui disparaît à la chaleur puis se reforme tout seul ↗