University of Surrey Creates Plastic That Sublimes and Reforms

A polymer developed at the University of Surrey sublimes at 90°C without passing through liquid phase, then reforms into solid when cooled—enabling a recycling cycle that skips conventional waste stre

Researchers at the University of Surrey created poly(1,2-dithiolane), a polymer that sublimes at 90°C without passing through liquid phase. When heated, it vaporizes and reassembles into solid form upon cooling. The material demonstrated practical applications in lab settings: it provides waterproof protection via filter paper coating that can be removed by heating, and it eliminates Nile red dye contaminants through thermal processing without additional chemicals. Published in *Macromolecules* in 2026, the work was led by Touseef Kazmi and Peter Roth. This cycle enables recycling without new raw materials, potentially improving plastic waste management efficiency.

The mechanism relies on the polymer’s unique phase transition—solid to gas without liquid—allowing it to be reformed after heating. For now, it functions only as a lab-scale proof-of-concept. It shows potential for biomedical uses and improved recycling, but remains impractical for consumer products like food packaging or toys. Notably, it does not replace conventional plastics.

This advances plastic recycling efficiency without new raw materials, reducing waste and pollution in recycling pathways. However, it is not yet ready for real-world use. The next step is scaling the process for industrial applications while addressing material stability in diverse environments. Current limitations mean it won’t impact everyday plastic consumption until practical prototypes emerge.

Source: ScienceAlert