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Design of a High-Strength XSBR/Fe3O4/ZDMA Shape-Memory Composite with Dual Responses

In this paper, dual-response shape-memory polymers (SMPs) based on carboxylic styrene butadiene rubber (XSBR)/ferriferrous oxide (Fe3O4)/zinc dimethacrylate (ZDMA) were designed. Fe3O4 was incorporated to endow XSBR with a magnetic property and improve its glass transition temperature (Tg). ZDMA was employed as an in situ reinforcer and compatibilizer for Fe3O4 and XSBR, which further improved Tg of the SMPs by introducing ionic cross-linking points. With incorporation of 10 phr ZDMA, Tg increased to 28.3 °C, the shape fixation ratio of the SMP was ∼100% at room temperature, the shape recovery ratio was ∼100% in both a thermal field and an alternating magnetic field, and the tensile strength reached 30.26 MPa. The chemical and physical properties of the SMPs were characterized by curing tests, cross-link density measurements, scanning electron microscopy, differential scanning calorimetry, and tensile tests. Such dual-response SMPs exhibit potential applications in intelligent biomedical devices over a wi...