HC Plastics News:
Self-healing polymer material as a smart material can repair cracks or local damage caused by external forces during use, thereby restoring its original function and prolonging its service life. The material has potential applications in surface coating protection, biomedical materials, lithium batteries, and aerospace. To meet different applications, researchers have introduced "sacrificial bonds" into polymer materials and developed self-healing plastics, gels or elastomers. For self-healing elastomer materials, good mechanical properties, efficient self-healing efficiency and excellent optical performance are challenging challenges. With the support of the National Natural Science Foundation of China, Dong Xia, a researcher at the Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, has devoted himself to the development and application of smart materials. On this basis, from the molecular design point of view, a new self-repair design strategy “PhaseLocked Dynamic Chemical Bonds†was proposed, which successfully produced a colorless, transparent, fast self-healing high-toughness and high-strength polymer. .
The research work is carried out through a combination of "hard segment locking" and "microphase separation control". The designed disulfide-containing self-healing polyurethane elastomer (PUDS) exhibits excellent optical properties of colorless and transparent, and the maximum tensile strength can be Up to 25MPa, the elongation at break exceeds 1600%. Under mild heating conditions (70oC), the scratch on the surface of the elastomer can be quickly recovered within 60s, and it exhibits good repeated scratch self-repair function. The haze value of the repaired material was only 0.6%. This colorless, highly transparent self-healing feature makes this material an important application prospect in the field of optics. Relevant results were published in Advanced Materials. 
Editor in charge: Honor
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