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Schematic illustration of a white-light-emitting mechanoresponsive polyurethane blend involving three polymers with different rotaxane-based supramolecular mechanoluminophores. Right: idle state. Left: mechanically activated state. The rotaxanes contain cycles with attached fluorophores (blue, green, orange) and a matching quencher (brown) in the axle of a dumbbell-shaped molecule with two stoppers (gray). Red arrows indicate mechanical force.
