Why should a plastic bag languish in a landfill when it could be powering your computer?
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.
"They are also working very well as an anode for a lithium ion rechargeable battery," Pol said. These are the types of batteries used in mobile phones and laptops, for instance. (Pol is also investigating carbon nanotubes made from plastic bags via a similar process for several applications including rechargeable batteries.)
Carbon microspheres are also useful in lubricants, toner, paint and filters, Pol said.
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. He holds the material in a sealed container that builds up pressure as the material gets hotter and hotter and becomes a gas.
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