One challenge of accessing the benefits of dynamic bonds in polymeric systems is their often limited ability to rearrange when the polymer is in the glassy state. We demonstrate the ability to induce a mechanical response in poly(alkylurea urethane) networks under dynamic loading with the exposure of UV light and the inclusion of azobenzene derivatives. The location of the azobenzene derivatives (in the backbone, as a pendant group, or in the network volume) and the bond activation energy of the hindered amine dictate the degree of the mechanical response.

Light-induced mechanical response in poly(alkylurea urethane) networks containing azobenzene compounds

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ACS Fall 2022

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