Nanocomposites of Epoxy with FeO Featuring Dynamic Disulfide Bonds: Fracture Toughness, Reprocessing, and Functional Properties.

Nanocomposites of epoxy with FeO featuring dynamic disulfide bonds were fabricated. To facilitate the dispersion of FeO nanoparticles, we synthesized poly(ε-caprolactone)-grafted FeO nanoparticles, which were then incorporated into epoxy to generate robust interfacial interactions between epoxy and the inorganic nanoparticles. Through this approach, a fine dispersion of the inorganic nanoparticles in the epoxy matrix was successfully obtained. The incorporation of FeO nanoparticles with fine dispersion resulted in the epoxy being effectively toughened; the critical stress field intensity factor () was enhanced twice as the control epoxy. Thanks to the integration of the dynamic covalent bonds (i.e., disulfide bonds), the nanocomposites displayed excellent reprocessable or recyclable properties. Depending on the contents of poly(ε-caprolactone)-grafted FeO nanoparticles, the nanocomposites can be modulated to have shape recovery with the desired shape transition temperatures. Benefiting from the dynamicity of disulfide bonds, the shape memory behavior featured reconfigurability. Inheriting from the nature of FeO nanoparticles, the nanocomposites likewise displayed superparamagnetic and photothermal properties. By taking advantage of the photothermal behavior, shape memory can be triggered through infrared laser irradiation and in a noncontact manner.