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The new material, called poly(diketoenamine), or PDK, was reported in the journal Nature Chemistry
The researchers first discovered the exciting circular property of PDK-based plastics when Christensen was applying various acids to glassware used to make PDK adhesives, and noticed that the adhesive’s composition had changed. Curious as to how the adhesive might have been transformed, Christensen analyzed the sample’s molecular structure with an NMR (nuclear magnetic resonance) spectroscopy instrument. “To our surprise, they were the original monomers,” Helms said.
After testing various formulations at the Molecular Foundry, they demonstrated that not only does acid break down PDK polymers into monomers, but the process also allows the monomers to be separated from entwined additives.
Powerhouse Energy developer Waste2Tricity (W2T) has signed a binding memorandum of understanding with recyclers Advanced Sustainable Developments (ASD), which will see them work together at the Protos site in Cheshire.
Source: rebnews.com - Waste2Tricity and Advanced Sustainable Developments join forces to tackle plastic waste
Peel Environmental has announced a partnership with Waste2Tricity to provide a ‘UK first’ plastics to hydrogen plant at its 54-acre Protos site in Cheshire.
Using Distrubted Modular Gasification, an advanced thermal treatment technology developed by Powerhouse Energy, it will produce a local source of hydrogen from unrecyclable plastics.
This £7 million plant will treat up to 25 tonnes of waste plastics a day that would otherwise go to landfill or be incinerated.
ts building block is a monomer called diketoenamine: a compound formed by sticking a triketone to an amine.
Condensing these units into a long string forms a plastic called poly(diketoenamine) – or PDK – and the bonds can be dissolved with ease using nothing more than a 12-hour soak in a strong acid bath.
"With PDKs, the immutable bonds of conventional plastics are replaced with reversible bonds that allow the plastic to be recycled more effectively," says chemist and team leader Brett Helms.
By breaking the polymers down easily, the plastic's core units can be separated from any additives over and over again in what is described as a closed-loop cycle.
originally posted by: Peeple
a reply to: TEOTWAWKIAIFF
What do we do with hydrogen?
The Fischer–Tropsch process is a collection of chemical reactions that converts a mixture of carbon monoxide and hydrogen into liquid hydrocarbons. These reactions occur in the presence of metal catalysts, typically at temperatures of 150–300 °C (302–572 °F) and pressures of one to several tens of atmospheres. The process was first developed by Franz Fischer and Hans Tropsch at the Kaiser-Wilhelm-Institut für Kohlenforschung in Mülheim an der Ruhr, Germany, in 1925.[