Ultrahigh toughnesses of stretchable ratiometric mechano-fluorescent polyurethane elastomers enhanced by dual slide-ring motions of polyrotaxane cross-linkers and daisy chain backbones

Mechanofluorophoric polyurethane elastomers containing dual slide-ring motion of daisy chain backbones and polyrotaxane crosslinkers are created, which show noble mechanical features and ratiometric mechanofluorescent responses under tensile forces.