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takyon [soylentnews.org] writes:

Endlessly recyclable plastic [labnews.co.uk]

By separating plastic monomers from chemical additives, researchers may have created fully recyclable plastics.

Molecular scientists at the Lawrence Berkeley National Laboratory developed a new type of plastic: polydiketoenamine, or PDK. When immersed in an acidic solution, PDK monomers were broken down and were freed from the additive compounds used in plastic production.

Berkeley Lab staff scientist Brett Helms said: "With PDKs, the immutable bonds of conventional plastics are replaced with reversible bonds that allow the plastic to be recycled more effectively."

Commercial plastics generally contain additives such as dyes or fillers to make them hard, stretchy, coloured or clear. The problem is these additives have different chemical compositions and are hard to separate from the monomers.

Also at Berkeley Lab [lbl.gov].

See also: Researchers develop plastic that they are calling the 'Holy Grail' of recycling [thehill.com]
This infinitely-recyclable plastic might help us finally clean up landfills and oceans [zmescience.com]

Closed-loop recycling of plastics enabled by dynamic covalent diketoenamine bonds [nature.com] (DOI: 10.1038/s41557-019-0249-2) (DX [doi.org])

Original Submission