British media said that Japanese researchers accidentally discovered that a hard and transparent plastic can be repaired by hand when cracked.
According to the British "Times" website reported on December 19th, this glass-like substance was originally studied as a new type of bio-molecule glue, which can be repaired by pressing it for 30 seconds at room temperature.
According to the report, although researchers have discovered a large number of self-healing materials in recent years, this is the first material to combine this property with the robustness of rubber or thermoplastics. It may be used to make items such as durable glassware and shatterproof windshields.
Liu Zeyou, a graduate student at the University of Tokyo, inadvertently solved a problem that has plagued his peers for decades, when he prepared to make a binder with a polymer called TUEG3. He found that this material, which is only 2 mm thick and of a Sim card size, can easily support a load of 300 grams. When the surface ruptures, all he has to do is compress it for half a minute at an ambient temperature of 21 degrees Celsius, and it will become like new.
Liu Zeyou and his colleagues published an article in the American journal Science explaining that hard polymers are often repaired only at high temperatures, and polymers that are easy to heal are often fragile because, as the gap closes, They tend to form crystals. They wrote: "So far, when designing rubber-like soft materials and hydrogen-based thermoplastic elastomers, they strive to heal under mild extrusion conditions. However, the appearance of a large number of hydrogen bonds often leads to the crystallization of polymer materials. To make them brittle. In other words, high mechanical robustness and healing ability are often mutually exclusive."
According to reports, TUEG3 comes from a family of molecules called polyether thiourea. The advantage of TUEG3 is that its structure—especially the rather confusing arrangement of hydrogen bond arrays—makes it relatively easy to restore old shapes without Crystallization.
Liu Ze right said that he was shocked by his own discovery. He told the NHK: "I was dubious when I found it, so I repeated the experiment many times. I hope that this repairable glass can become a new environmentally friendly material. If it is broken, it does not need Throw it away."
The report said that it is still to be seen whether this discovery can be used to make a touch screen. In April of this year, a research team at the University of California, USA, announced that it had developed the first electrically conductive self-healing polymer. This year, Motorola applied for a patent for a smartphone screen that can be self-healing by generating heat. 
Editor in charge: Ye Dan
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