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This mechanism is particularly interesting in poly-urea and polyurethane urea based systems, in which the amine bonds is present [32]. The reversion of the amine bond can form ketene, which is highly reactive for the reversible interaction. Therefore, the isocyanate can be used as a reactant with an amine group to form a urea bond. This type of bonds is stronger compared to hydrogen bonding.

Rekondo et al. [33] developed a self-healing poly (urea urethane) that contains both amino and quadruple hydrogen bonds. A sample with those characteristics can be completely separated and bonded by physical contact, exhibiting a rapid self-healing ability at room temperature due to the combination of both bonds type.