A Highly Transparent Self-healable Elastic Coating Material with Enhanced Mechanical Surface Properties and Folding Reliability
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A highly transparent self-healable elastic coating material (ShEC) based on functional fluorinated imide (FDI) is prepared, and its self-healing characteristics, mechanical properties, and folding reliability are investigated. FDI is synthesized by reacting functional fluorinated dianhydride and 2-aminoethanol, followed by thermal imidization in the solution phase. ShEC is produced by reacting a mixture of FDI and polyol with a cross-linker containing multiple isocyanate groups. ShEC exhibits significantly enhanced self-repairability at room temperature, excellent pencil hardness (4H grade), and superior folding reliability (over 200,000 folding/unfolding cycles at a radius of 1.5 mm). These are ascribed to the unique supramolecular structure resulting from the strong hydrogen bonds between the imide groups in FDI and the urethane groups in the matrix. The mechanism for improved self-healability, mechanical properties, and folding reliability is also proposed in this study.