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Thursday, 19 September 2019
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Raw materials & technologies, Applications, Automotive coatings

New plastics heal like human skin after being scratched

Thursday, 29 March 2012

A new genre of plastics that mimic the human skin’s ability to heal scratches and cuts offers the promise of endowing cell phones, laptops, cars and other products with self-repairing surfaces, scientists reported during a meeting of the American Chemical Society (ACS) on March 26, 2012. Maybe this polymercompound could be adopted in functional coatings as well to heal scratches on metal as well.

New plastics turn red when damaged, then heal themselves when exposed to light. Source: Carsten Steps - Fotolia.com

New plastics turn red when damaged, then heal themselves when exposed to light. Source: Carsten Steps - Fotolia.com

"Mother Nature has endowed all kinds of biological systems with the ability to repair themselves,” explained Professor Marek W. Urban, Ph.D., who reported on the research. "Some we can see, like the skin healing and new bark forming in cuts on a tree trunk. Some are invisible, but help keep us alive and healthy, like the self-repair system that DNA uses to fix genetic damage to genes. Our new plastic tries to mimic nature, issuing a red signal when damaged and then renewing itself when exposed to visible light, temperature or pH changes.”

Urban, who is with the University of Southern Mississippi in Hattiesburg foresees a wide range of potential applications for plastic with warn-and-self-repair capabilities. Scratches in automobile fenders, for instance, might be repaired by simply exposing the fender to intense light. Critical structural parts in aircraft might warn of damage by turning red along cracks so that engineers could decide whether to shine the light and heal the damage or undertake a complete replacement of the component. And there could be a range of applications in battlefield weapons systems.

Self-healing plastics have become a Holy Grail of materials science. One approach to that goal involves seeding plastics with capsules that break open when cracked or scratched and release repairing compounds that heal scratches or cuts. Another is to make plastics that respond to an outside stimulus — like light, heat or a chemical agent — by repairing themselves.

Urban’s group developed plastics with small molecular links or "bridges” that span the long chains of chemicals that compose plastic. When plastic is scratched or cracked, these links break and change shape. Urban tweaked them so that changes in shape produce a visible color change — a red splotch that forms around the defect. In the presence of ordinary sunlight or visible light from a light bulb, pH changes or temperature, the bridges reform, healing the damage and erasing the red mark.

Watch the Prof Urban speech during the meeting

Other functional coatings will be presented at the European Coatings Conference "Functional Coatings”

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