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With the development of science and technology, the need for high performance sensors is more and more urgent to deal with different needs and environments. In this study, a flexible strain sensor with performance of self‐healing is developed based on porous nickel as conductive filler and polyurethane (PU) with hydrogen bonding, disulfide bond, and metal coordination bond as polymer matrix. Porous nickel is prepared by a new biotemplates method, and the effects of reaction temperature and concentration of NiCl2·6H2O on the morphology of porous nickel are studied. Polyurethanes containing hydrogen bonding, disulfide bonds, and metal coordination bonds are prepared, and the mechanical properties and self‐healing properties of polyurethanes with different contents of hard and soft segments are studied. A strain sensor is prepared by mixing porous nickel and polyurethane. The effect of filler content on mechanical properties, self‐healing properties, and electrical self‐healing properties is studied. The sensor is attached to the joints of human limbs, and the peak diagram of time‐relative resistance changes is obtained through the cyclic and repeated movements of the limbs. The sensor has excellent sensitivity. [ABSTRACT FROM AUTHOR]

Polyurethane has attracted the great attention of scientists because of its lightweight, high toughness, good wear resistance and corrosion resistance. In the past, polyurethane was mainly used in low‐end products because of its single function. With the development of science and technology, ordinary polyurethane has been unable to meet the diverse needs of people. In recent years, scientists have developed a lot of functional polyurethane: self‐healing polyurethane, antifouling polyurethane, antibacterial polyurethane, shape memory polyurethane and electromagnetic shielding polyurethane. Polyurethane with a single function has been reported by many people, while polyurethane with multiple functions has been rarely reported. This review comprehensively reviews the structural design and applications of functional polyurethane. In addition, the advantages and disadvantages of chemical grafting functional polyurethane are introduced emphatically. Finally, challenges and future research directions of functional polyurethane are also discussed. [ABSTRACT FROM AUTHOR]