Closing the loop (IMAGE) Aarhus University Caption Researchers at Aarhus University have invented and patented a method to break down the chemical bonds in a polyurethane foam mattress and extract its monomeric building blocks. The polyol (the molecule in the red circle) can then be reformulated into a new PU foam mattress. Credit Aarhus University Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.