High-strength, high-toughness, self-healing thermosetting shape memory polyurethane enabled by dual dynamic covalent bonds

Abstract

Smart materials that integrate multiple functions into one system will broaden the application range of materials, but there are still challenges to obtain a material with excellent shape memory, toughness,...

Recent advances in self-healing polyurethane based on dynamic covalent bonds combined with other self-healing methods

“…Xiaoyue Wang et al synthesized a novel chain extensibility agent containing diimide bonds and disulfide bonds and incorporated them into thermosetting PU. 97 The mechanical properties of PU containing double dynamic bonds are better than those of PU containing only disulfide bonds or imine bonds. Additionally, because of the low T g of double dynamic bond PU, these PUs have a good low temperature flexibility.…”

Toward mechanically robust self-healing polyurethanes using dynamics chemistry

“…Larger bond energy can provide higher mechanical properties. Dynamic covalent bonds that have been used in self-healing PUs include the disulfide bond, [83][84][85] Diels-Alder bond, [86][87][88][89] borate ester bond, 84,[90][91][92] imine bond, 93,94 hydrazone bond [95][96][97] and urethane bond. 98…”

Molecularly Engineered Tough and Room-Temperature Self-Healing Polyurethanes for Resistive Strain Sensors

“…Due to the limited thermodynamic compatibility between its soft and hard segments, TPU exhibits a microphase-separated structure, which imparts superior toughness and elasticity to the material. − By changing the structures of the soft and hard segments or chain extenders, the performance of TPU can be tailored over a wide range . In recent years, researchers have achieved a self-healing effect by incorporating dynamic covalent or noncovalent bonds into the molecular structure of TPU, such as Diels–Alder bond, , imine bond, , boronate ester bond, oxime bond, disulfide bond, , metal ion coordination bond, hydrogen bond, − and so on. These dynamic bonds endow TPU with self-healing performance under external stimuli.…”