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E-Mail IMAGE: Rice University chemists turned otherwise-worthless pyrolyzed ash from plastic recycling into graphene through a Joule heating process. The graphene could be used to strengthen concrete and toughen plastics used in. view more Credit: Tour Group/Rice University HOUSTON - (Jan. 13, 2021) - Pyrolyzed plastic ash is worthless, but perhaps not for long. Rice University scientists have turned their attention to Joule heating of the material, a byproduct of plastic recycling processes. A strong jolt of energy flashes it into graphene. The technique by the lab of Rice chemist James Tour produces turbostratic graphene flakes that can be directly added to other substances like films of polyvinyl alcohol (PVA) that better resist water in packaging and cement paste and concrete, dramatically increasing their compressive strength. ....