Turning one of the world's most difficult plastics into premium lubricant
Virginia Tech chemist and chemical engineer Guoliang "Greg" Liu and his lab have developed a process that converts the plastic polyvinyl chloride (PVC) into polyalphaolefin, a key component in lubricants such as engine oil. Published Aug. 5 in the journal Nature, the research could help address two environmental challenges: recycling one of the world's most difficult plastics and producing a valuable industrial material.
Because of its chlorine content and the variety of additives used by different manufacturers, PVC is among the hardest plastics to recycle. As a result, much of it ends up in landfills.
At the same time, lubricants such as engine oil are environmentally costly to produce and are in growing demand. By converting discarded PVC into a key lubricant ingredient, the Liu lab's process offers a potential way to reduce plastic waste while creating a high-value product.
Lubricants may go unnoticed, but they keep the world running smoothly. Engine oil is used in everything from lawn mowers and passenger vehicles to jet engines, making a reliable supply of lubricant components essential across industries.
Turning household PVC into oil
The Liu lab has developed a process that could help reverse the already alarming plastic pollution problem.
The team takes the PVC you'd find around your home in plumbing, window structures and even credit cards and puts it into a solvent. Aluminum tetrachloride and alpha-olefins are added, and the mixture is heated to 158°F (70°C) for three hours. The product extracted from the solvent is a relatively thick oil—a lubricant.
"First, we have proved that it is feasible to use plastic waste to make high-performance lubricants. Second, these lubricants are environmentally friendly, and they can meet the market's emerging sustainability needs," Liu said.
The idea for the process started with the team's earlier publications, featured in Science and Nature Sustainability, about converting other types of plastic waste into surfactants such as soap and detergents. When that proved successful, researchers turned their attention to PVC.
"We want to help improve the recycling and upcycling of PVC," Liu said.
A team built around the challenge
To move the project forward, Liu assembled a team of graduate researchers. He tapped Eric Munyaneza Nuwayo, a doctoral student in the final year of his doctoral program, to lead the effort. Connor S. Thompson, a graduate student in the chemistry department, was initially focused on a different research project. When Liu proposed a new direction, Thompson embraced the challenge.
The team also included Abby Civiello, a first-year graduate student whose contributions quickly made a substantial impact in the lab. "I often called them the Three Musketeers," Liu said.
Team members started by attempting to transform the PVC molecules into something else and experimenting with the materials.
"The idea was simple. PVC, as one of the most activated forms of polyethylene, ought to be easily converted into some other molecules by replacing the chlorine atoms with other groups," Liu said.
Despite their efforts, the material they produced was never functional. It was always soft—a little gooey—and not as high-performing as they wanted.
"One day I realized—if this polymer is so gooey and so soft, why don't I just keep breaking the polymer chains down into smaller segments?" said Liu.
From failed material to useful product
But as team members advanced the process, converting PVC into new molecules and testing the performance of the resulting product, Liu realized they had uncovered something far more promising than a recycling method.
He turned to colleagues in the field to help identify exactly what they had created. Liu sent samples of the oil to Ali Erdemir at Texas A&M University, and researchers there began testing and standardizing the process. Liu also worked with William Goddard from Caltech on chemical computations. Virginia Tech colleague Xi Chen then provided an economics and production perspective, developing models for how this oil could be produced on a large scale.
The next step, said Liu, is making the lubricant even more sustainable and more accessible.
"Lubricants are the silent heroes out there. We often don't recognize that they exist, but they are out there working quietly. We want to be able to produce the oil on a larger scale to reach more people around the world," Liu said.
Publication details
Guoliang Liu, Upcycling of polyvinyl chloride into polyalphaolefin lubricants, Nature (2026). DOI: 10.1038/s41586-026-10867-z. www.nature.com/articles/s41586-026-10867-z
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Citation: Turning one of the world's most difficult plastics into premium lubricant (2026, August 5) retrieved 5 August 2026 from https://phys.org/news/2026-08-world-difficult-plastics-premium-lubricant.html
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