NMR-measured mechanical conversions of PMA1-PMA3 align with results from UV-vis studies. Polymers were sonicated in acetonitrile (15 mL, 2 mg/mL), isolated, and their structures analyzed using NMR spectroscopy. As a representative, Figure shows the 1 H NMR spectrum of PMA3 subjected to ultrasonication: a new set of resonances (blue shade) emerged, consistent with the structure of antiparallel diarylethenes observed in a separately synthesized control polymer PMA3ap. NMR results indicate that sonication for 5 minutes converts approximately 40.2%, 52.5%, and 63.7% of PMA1, PMA2, and PMA3, respectively (see Figure ). These NMR results align with the pseudo-first-order kinetics determined by UV-vis for PMA1-PMA3 (Figure and Figure ), which predicted conversions of 40.8 %, 51.6%, and 69.8% after the same ultrasonication duration, respectively.