Virginia Tech scientists have developed a water-based method to make strong, compostable bioplastic films at industrial speeds. The approach could help replace single-use petroleum plastics with safer, scalable packaging.
About a third of the plastics we use are designed to last for decades but are tossed after just one use. A Virginia Tech research team is working to change that with a new way to make compostable packaging that can actually compete with conventional plastic on performance and cost.
Researchers in the Department of Sustainable Biomaterials have developed a water-based process to create multilayer bioplastic films that are strong, protective and easier to manufacture at industrial scale. The method avoids toxic solvents and is designed to run at speeds similar to existing packaging and paper production lines.
“Scalability and non-toxicity are critical,” co-corresponding author Young-Teck Kim, a professor of sustainable biomaterials in the College of Natural Resources and Environment, said in a news release.
The team set out to design a process that fits into how packaging is already made, rather than a lab-only solution that would be too slow or expensive to adopt.
“Our goal was to create a process that industry can realistically adopt while improving environmental outcomes. This is just the first generation of the technology, and it shows strong potential to replace conventional materials and expand the use of bioplastics,” Kim added.
The research targets one of the toughest problems in sustainability: single-use packaging. From snack wrappers to shipping envelopes, these items are typically made from petroleum-based plastics that can persist in landfills and oceans for hundreds of years.
Bioplastics, made from renewable sources such as plants or microbes, are often promoted as greener alternatives. But in practice, many have serious limitations.
“Many current bioplastics require specific industrial facilities to break down,” added Kim. “If they end up in the environment, they can behave like traditional plastics.”
To tackle that problem, the Virginia Tech team turned to polyhydroxyalkanoate, or PHA, a newer type of bioplastic produced by microorganisms. PHA can biodegrade in natural environments, including soil and marine settings, and can also break down under home composting conditions. That makes it especially promising for everyday packaging that is unlikely to be collected and processed in specialized facilities.
On its own, however, no single bioplastic checks every box that packaging companies need. Food and consumer goods must be protected from oxygen and moisture, and packages must be durable enough to survive shipping and handling. That is why most commercial packaging uses multilayer films, where each layer brings a different strength.
The Virginia Tech researchers followed the same strategy with more sustainable ingredients. They combined PHA with a plant-based material and applied it using a water-based spray coating process to build up multiple layers. The resulting film is designed to balance strength with barrier performance, two of the most important requirements for food and consumer packaging.
In tests, the multilayer films showed stronger bonding between layers and better resistance to oxygen and water vapor than the base materials alone. Those improvements are critical for keeping food fresh and protecting sensitive products without relying on conventional plastics.
Traditional methods for making multilayer packaging often depend on high heat or chemical solvents to fuse layers together. These techniques can be energy-intensive, difficult to scale and harmful to workers and the environment. Existing manufacturing methods create technical challenges like weak bonding between layers or limited compatibility between materials, Kim said.
By contrast, the new water-based system is designed to be cleaner and more efficient. It improves what engineers call processability, or how easily a material can be manufactured at scale, while matching the speed of current industrial production systems. The approach is similar in spirit to paper manufacturing, where water-based slurries are formed and dried into continuous sheets.
The study, published in the journal Food Packaging and Shelf Life, involved collaborators in food science and technology and biological systems engineering, as well as industry partners. The team has also received a provisional patent for the invention, an early step toward potential commercialization.
Although the work is still in its first generation, the researchers see it as a foundation for a new class of packaging materials that are both high-performing and designed with their full life cycle in mind. If such films can be produced at scale and adopted widely, they could help reduce the environmental footprint of single-use plastics, from production through disposal.
Next steps will likely include optimizing the film formulations for different types of products, testing performance under real-world packaging and shipping conditions, and working with manufacturers to integrate the water-based coating process into existing lines.
For students and consumers, the research highlights a broader shift in materials science: designing everyday products that work just as well as the old ones, but are safer for people and the planet.