
Rather than languishing in landfills or littering roadsides, plastic bags could make their way into useful products like toner, lubricants, or rechargeable cell phone or laptop batteries, if new research becomes commercialized.
Plastic recycling is limited by the fact that different types of plastic cannot be mixed. The quality of the resulting recycled plastic may also be poor. "That's why recycling is not very successful," said study author Vilas Pol of Argonne National Laboratory in Argonne, Ill.
I was thinking why not go beyond this," he said. "Take it and degrade it. You can take the different kinds of plastics together."
In a process that is as simple as throwing bits of plastic in a chamber and heating it up, Pol can turn the plastic into tiny spheres of pure carbon just a few microns across.
These spheres, which conduct heat and electricity, could be useful in a long list of applications from tires to batteries to lubricants.
Adding the spheres to tires, for instance, could dissipate the heat generated from friction against the road, protecting the rubber from melting. Carbon microspheres are also useful in lubricants, toner, paint and filters.
Rather than just melting the waste plastic and re-extruding it, Pol's process continues to heat plastic bags or other plastic waste past the point of melting.
At high temperatures and pressures in the chamber, the plastic decomposes into its elements. If the chamber is filled with inert gas instead of air, the hydrogen in the plastic becomes hydrogen gas, which can be collected and used as hydrogen fuel.
The carbon in the plastic forms spheres or egg-shapes depending on the type of waste plastic used in the reactor. The uniform size and shape make the spheres particularly useful for certain applications, like filtration, where packing tightly together is useful.

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