“When the polymer is damaged and exposed to sunlight, it is capable of repairing itself,
and could be applied to many systems.”

The next time your car is keyed, park it under a ray of sunshine. If your car is coated in a new polyurethane film developed by scientists from the University of Southern Mississippi, the scratch will be gone in an hour. The research is detailed in the current issue of the journal Science.
The new coating is 99.99 percent standard polyurethane, a material found in a wide range of products, including hard plastic and soft foams. The remaining 0.01 percent is either a four-molecule oxetane ring or a long rod of chitosan. Chitosan is closely related to chitin, the tough material found in the shells of lobsters and crabs.
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