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As an intelligent material, self-healing polymer material can repair cracks or local damage caused by external forces during use, thus restoring its original function and extending its service life. The material has potential applications in the fields of surface coating protection, biomedical materials, lithium batteries and aerospace. To meet different applications, the researchers introduced "sacrifice bonds" into polymer materials and developed self-healing plastics, gels or elastomer
Chinese
. For self-healing elastomer materials, taking into account good mechanical properties, efficient self-healing efficiency and excellent optical performance is a challenge. With the support of the National Natural Science Foundation of China, Dong Man, a researcher in the Key Laboratory of Engineering Plastics of the Institute of Chemistry of the Chinese Academy of Sciences, has made a series of progress in the development and application of intelligent materials. On this basis, from the molecular design point of view, a new self-healing design strategy, Phase Locked Dynamic Chemical Bonds, was proposed to successfully prepare a colorless transparent, fast self-healing high-tough polymer.
research work is carried out through a combination of "hard segment locking" and "microphase separation control", and the design of a desulfur-containing self-healing polyurethane elastomer (PUDS) exhibits excellent optical properties of colorless transparency, with a maximum tensile strength of up to 25 MPa and fracture elongation. With a rate of more than 1600%, in mild heating conditions (70oC), elastomer surface scratches can be recovered quickly within 60s, while showing good repeat scratch self-healing function, after multiple scrapes self-repair material fog value of only 0.6%. This colorless, highly transparent self-healing feature makes the material an important application prospect in the field of optics. The results were published in Advanced Materials.
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