Superior Robust, Transparent and Stretchable Self-healing Polyurethane for Flexible Devices
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Polyurethanes as self-healing materials have attracted great interests due to their thermo-processability, high mechanical properties, high flexibility, and scratch resistance. In particular, polycarbonate-based polyurethane shows transparency, weatherability and excellent mechanical properties. Disulfide bond is a reversible covalent bond based on the thiol-disulfide dynamic exchange reaction. The introduction of the disulfide bonds enables the polyurethane thermal reversibility. Herein, we report a novel self-healing polyurethane with robust and transparent, which shows excellent self-healing ability with 98 % healing efficiency and excellent shape memory ability with recovery efficiency of ˃92 %. The change of the electrical resistance as a function of flexural strain suggested the potential application of the prepared film as a self-healing flexible substrate for flexible electronics.