Ratiometric Mechano-Fluorescent Elastomers Dually Promoted via Effective Force-Triggered Radicals and Preeminent Toughnesses/Stretchabilities by Unconventional Shuttling Dimensions of Tetraphenylethylene-Suspended [c2] Daisy Chain Rotaxanes.

ABSTRACT: Innovative radical-type mechano-fluorescent polyurethane (PU) elastomers were developed by integrating axle- and macrocycle-exerted force modes of tetraphenylethylene (TPE)-functionalized daisy chain rotaxanes with expanded/contracted conformations into polymer matrices, revealing distinct mechanical and optical performances under external tensile forces. Surprisingly, the designed PU films containing negligible amounts (0.02% molar ratio of all monomers) of daisy chain structures with unconventional shuttling dimensions (as artificial molecular muscle tougheners) exhibited ultrastretchable capabilities and preeminent toughnesses, possessing a record-high toughness of 1363 MJ/m³ at the strain rate of 20 mm/s, approximately 6.3 times tougher than the standard PU films, along with

SUBMITTER: Cuc TTK 

PROVIDER: S-EPMC12810041 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature