The elasticity, elasticity, and film materials that are common in people's lives and have good stretchability have a stretching ratio of no more than tens of times. However, Chinese scientists have created a miracle: they have developed a polymer that can stretch 13,000 times. Related articles were published in the "Advanced Materials", a top international academic journal in the field of materials. How long can the material stretch? This interesting question is a huge challenge for materials researchers. The stretching ratio of ceramic materials is usually small, and the stretching ratio of metallic materials is usually not more than 10 times (superplastic stretching can reach thousands of times under certain special conditions), and so far, the polymer body can be stretched multiple times. The highest record is about 180 times, and the stretching ratio of the gel material is only 210 times. Now, researchers from the Chinese Academy of Sciences have set a new record: for the first time, the maximum stretching ratio of polymer materials has been increased to 13,000 times. Researcher Zhao Ning / Researcher Xu Jian of the Institute of Chemistry, Chinese Academy of Sciences designed and prepared a polymer network structure. Through the synergy of strong and weak dynamic bonds, the polybutadiene (PB) material was successfully stretched. The multiple has increased to more than 10,000 times. This polymer material contains a cross-linked network of ionic hydrogen bonds and imine bonds. Under certain conditions, dynamic cross-linking points in the network dissipate energy through reversible fracture or dynamic exchange, which effectively prevents the material from irreversible damage. During the stretching process, a small amount of imine bonds are used to maintain the network structure, and a large number of ionic hydrogen bonds dissipate energy. The synergy between the two mechanisms enables the polymer material to successfully obtain super tensile properties. Good stretchability is a necessary condition for polymer materials to be used in flexible electronic devices, drives and energy storage. It is understood that this work was done in cooperation with Professor Cui Shuxun of Southwest Jiaotong University, Researcher Wang Jianping, Researcher Xiang Junfeng of Institute of Chemistry, Chinese Academy of Sciences, and Professor Anchang Shi of McMaster University in Canada. (Reporter Li Daqing)
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