Plastics that vanish in six days — not centuries. That’s the promise of a new “living plastic” built with microbes that wake up, eat their host, and leave nothing behind.

Plastics usually linger for up to a thousand years, outlasting entire civilizations. Yet researchers at the Chinese University of Hong Kong have engineered a material that can be destroyed on command. They embedded spores of Bacillus subtilis — a bacterium known for producing enzymes that cut apart long polymer chains — directly into a plastic called polycaprolactone (PCL). The spores lie dormant until they’re bathed in a nutrient broth heated to 50 °C. Once activated, they secrete two enzymes that dismantle the plastic from the inside out. Within six days, the material is gone, without a trace of microplastics.

Packaging that disappears after use: science is already testing it.  
Credit: New Atlas  


Zhuojun Dai, one of the study’s authors, explained the motivation plainly: “The realization that traditional plastics persist for centuries, while many applications, like packaging, are short-lived, led us to ask: Could we build degradation directly into the material’s life cycle?” That question shaped the entire project. Instead of relying on external recycling systems, the team designed the destruction mechanism into the plastic itself.

Calm surface, hidden expiration — the plastic dismantles itself from within.  
Credit: New Atlas

The two-enzyme system is the real breakthrough. Previous attempts used a single enzyme, which worked slowly and left fragments behind. Here, one enzyme slices the polymer chains at multiple points, weakening the structure quickly. The second enzyme then breaks those fragments down into smaller molecules that the microbes can fully consume. Together, they achieve near-complete degradation in less than a week — a pace unmatched by earlier methods.

To prove the concept, the researchers built a wearable electrode out of the living plastic. When exposed to the nutrient broth, the electrode degraded completely in twelve days. A conventional plastic electrode, tested in parallel, remained intact. The contrast was stark: one material persisted, the other erased itself.

There are caveats. The system currently works only with PCL, which is already considered biodegradable under certain conditions. And the trigger — a nutrient broth heated to 50 °C — is not something you’d find in everyday environments. Without it, the plastic behaves like any other. The team acknowledges this limitation and is working on a water-based trigger, since most plastic waste ends up in rivers and oceans. Expanding the technique to common single-use plastics is also on their agenda.

Still, embedding engineered microbes directly into the plastic matrix is a clever step forward. It transforms the material into something closer to a living system, with a built-in expiration mechanism. The implications are significant: packaging that disappears after use, electronics that dismantle themselves at end-of-life, medical devices that safely degrade inside the body. Each application would require careful tuning of the trigger, but the principle is now established.

The study, published in ACS Applied Polymer Materials in May 2026, doesn’t claim to have solved plastic pollution. What it does offer is a new way of thinking: plastics designed not just to serve a purpose, but to end themselves when that purpose is fulfilled. That shift — from permanence to planned disappearance — could redefine how we build and discard the materials that surround us.

Sources: New Atlas, American Chemical Society, Chinese University of Hong Kong (Link)