A multidisciplinary team of scientists has demonstrated a method to upcycle polyvinyl chloride (PVC), one of the plastics most difficult to dispose of or recycle, by turning it into a class of higher-value products—lubricants (Nature 2026, DOI: 10.1038/s41586-026-10867-z).
PVC is everywhere: water and sewage pipes, electrical cables, packaging materials, medical devices, yoga mats, car interiors, and numerous other products. It is strong and lightweight; resistant to corrosion, moisture, and fire; and cheap. But disposing of it is a headache, particularly because of its chlorine content, which can form and release toxic gases and seep into soil and groundwater.
In the new study, the researchers replaced the chlorine atoms in PVC with alkyl chains. They mixed powdered PVC waste (from pipes, gloves, credit cards, and toy frogs) with aluminum trichloride (AlCl3) at 70 ºC to remove the chlorine, leaving a hydrocarbon backbone. “We functionalized the backbone with α-olefin . . . forming branched structures that are useful for lubrication,” says Guoliang Liu, a chemical engineer at Virgina Tech and a lead author of the study.
The procedure produces vinyl-derived poly-α-olefin (vPαO), which, after a hydrogenation step to eliminate remaining unsaturated bonds, yields a high-value lubricant. The vPαO produced in this way has tunable properties, depending on where the chain splits along the PVC backbone. “Branch structure and branch length significantly dictate the performance of the final product,” Liu says.
This particular work also provides an opportunity for polymer editing, such as replacing the chlorine with other functional groups, Liu says. “This opens new chemistry that we can work on.” That includes “thinking out of the box about how can we utilize the carbon as a feedstock for other chemicals and materials,” he adds.
“Rather than treating PVC’s high chlorine content as a liability, the authors leverage the carbon–chlorine bonds as reactive sites to produce PαO-like lubricant base oils under relatively mild temperatures,” says Roger Ruan of the University of Minnesota, who wasn’t involved in the study. “The high dechlorination efficiency, along with the favorable viscosity, friction, and wear properties, is encouraging.”
Moreover, Ruan points out, the ability to produce a higher-value product could create stronger incentives for PVC recycling compared with conventional downcycling. He calls it “a promising platform” but says further work, including pilot-scale continuous operation and a life-cycle assessment, will be essential to determine its commercial and environmental competitiveness.
This is something the researchers are working on. In the paper, they include a techno-economic analysis that shows this approach could be a highly attractive way to upcycle PVC to make lubricant products. For reference, PVC is currently priced around $870 per metric ton, depending on location, while PαOs are priced at $3,000–$6,000 per metric ton. Liu is currently working on a start-up. “I’m looking forward to licensing this technology so that we can scale it up,” he says.
