Influence of Intermolecular and Intramolecular Hydrogen Bonds of Nature-Inspired Peptide Conjugation Breakers in Intrinsically Stretchable and Self-Healing Polymer Semiconductors
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In the realm of next-generation flexible and wearable devices, intrinsically stretchable polymer semiconductors play a vital role. Nature-inspired peptide conjugation breakers (PCBs) provide a robust framework for investigating both intermolecular and intramolecular hydrogen bonds, capitalizing on peptide diversity. Here, we introduce a novel intrinsically stretchable and self-healing polymer achieved by integrating PCBs into a diketopyrrolopyrrole-based polymer. Our study reveals distinct roles: intermolecular hydrogen bonds disrupt chain packing, reducing thin film crystallinity, while intramolecular hydrogen bonds restrict polymer chain conformation. Remarkably, the glycine-based PCB polymer exhibits mobility of 0.12 cm²/Vs and maintains the mobility even at 100% strain and through repeated cycles. PCB-containing polymers also exhibit self-healing properties, with cracks disappearing simultaneously alongside recovered electrical mobilities following solvent vapor and heat treatment.