According to a report recently organized by the Physicist Organization Network, "A new type of plastic can imitate human skin. When it is scratched or cut, it will 'bleed' and become red to alert the injured. After the wound is touched, it can heal itself. This is Aircraft, automobiles, cell phones, laptops, and other products provide an ideal self-healing surface.†This is a description of a research team of researchers at the University of Southern Mississippi at the 243rd American Chemical Society National Conference and Exposition.
The application of plastics is already very common, because it combines strength, light weight, corrosion resistance and other excellent features in one, can replace steel, aluminum, glass, paper and other traditional materials. However, scientists have also been working hard to rectify a major drawback of these ubiquitous materials: Once many plastics are scratched or broken, repairs can be difficult or impossible.
Self-healing plastics have become the holy grail of materials science. One of the ways to achieve this goal is to break open the seeded plastic capsules at the site of cracks or scratches, which can release the compounds that will heal the wounds. Another method is to make the plastic self-repair by external stimuli such as light, heat or chemicals.
Professor Marek, the principal researcher of the study, said: "Nature has given various biological systems the ability to repair themselves, such as self-healing skin after injury, and new bark growing after the trunk has been cut. But it is helping us to safeguard our lives and health, such as DNA (DNA) to repair the genetic damage caused by the self-healing system.This new type of plastic can imitate this ability in nature, when it is damaged, it will display a red alert. Signaling and then exposing it to visible light or changing temperature and pH can promote self-healing."
The research team developed plastics that use small molecular links or "bridges" to form long chains on plastic chemicals. When plastics are scratched or cracked, these links will be broken to change the shape, resulting in visible color changes. There will be red spots around the rift. When exposed to ordinary sunlight or light or when the pH or temperature changes, the “bridge†within it will be rebuilt, the injury will heal, and the red mark will be eliminated by itself.
This type of plastic, which can display an injury warning and have the ability to repair itself, can be widely used in many fields, such as scratches on car fenders, and may be exposed to strong light to repair itself; critical aircraft components are damaged. A red warning mark will be displayed on the edge of the rear crack, allowing the engineer to decide whether to "cure" the damage with a light, or perform a complete component replacement; it may also be used extensively on battlefield weapon systems.
Instead of relying on embedded healing compounds, new plastics can only be repaired once, but can be rehabilitated repeatedly; at the same time, they are more environmentally friendly than many other plastics because their production process is based on water-based plastics rather than relying on potentially toxic ingredients. The research team is now introducing other technologies to produce plastics that can withstand high temperatures. (Hua Ling)
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