A Self‐healing and Thermal Radiation Shielding Magnetic Polyurethane of Reducing Retro Diels–Alder Reaction Temperature

Self-healing magnetic polyurethanes have been fabricated with 4,4′-methylene diphenyl diisocyanate (MDI), poly(1,4-butylene adipate) (PBA-2000), furfurylamine (FMA), bismaleimide (BMI), and magnetic materials (magnetite, carbonyl iron, and magnetite-coated carbonyl iron which was prepared by a vortex mixer in a solid-state process). The magnetic polyurethanes have three properties of self-healing, thermal radiation shielding, and reducing the temperature of the retro Diels–Alder reaction. The magnetic polyurethanes showed the self-healing performance of a notch at 110 °C in a short time, the self-healing recovery was 82.1% in the breaking strength after the healing process, and the excellent thermal radiation shielding. The polyurethanes were investigated by Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), transmission electron microscope (TEM), optical microscope (OM), ultraviolet–visible (UV–Vis) spectroscopy, tensile testing, and thermal conductivity. Finally, the self-healing magnetic polyurethanes which with the properties can be promising materials for the building or the constructing applications in the future.