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Chemistry · L5 · Spiropyran Mechanophore Activation

How mechanical stretching of a polymer chain drives a spiropyran mechanophore to ring-open into its colored merocyanine isomer, converting invisible mechanical stress into a visible optical signal.

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Polymer chain at restSpiropyran mechanophore embedded in backbone: colorlessForce exceeds C-O bond activation threshold?C-O bond mechanically cleavedRing-opens to merocyanine isomer: conjugated, coloredVisible color change signals local stressForce removed: slow thermal reversion to spiropyran over timeMechanical stretching applies tensionNoYes

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