Thermoset shape memory polymer with permanent shape reconfigurability based on dynamic disulfide bonds

Thermoset shape memory polymers (TSMPs) show improved shape recovery and mechanical robust compared with the thermoplastic SMPs, but also exhibit restricted shape transformation and inferior reprocess-ability. Recently, introducing the dynamic bonds into TSMPs will endow the stable crosslinking topology with dynamic arrangement ability, which will address above issues. However, as widely used dynamic bonds in dynamic TSMPs such as urethane or ester have to be activated in the presence of external catalysts or initiators to accomplish exchange reaction. Therefore, it is highly desirable to develop TSMPs which possess excellent solid-state plasticity without catalysts or initiators, and it is urgent and essential to employ different dynamic bonds to broaden preparation methods and diversity of dynamic TSMPs. In this work, we fabricated dynamic TSMPs based on dynamic disulfide bonds to achieve solid-state plasticity and complex deformation. The as-obtained TSMPs exhibit good thermal properties, mechanic robust as traditional TSMPs. Besides, the acquired TSMPs show outstanding shape memory property in shape fixed 99% and shape recovery rate 98%. The obtained TSMPs could be suitable to a variety of future engineering application.