| Title |
Effective sliding motions of vibration-induced emission stoppers in mechanically interlocked molecules as artificial muscle tougheners and in situ molecular shuttling sensors for self-healable mechano-fluorescent polyurethane organogels |
| Authors |
Cuc, Tu Thi Kim ; Lai, Yu-Chen ; Khang, Trang Manh ; Chuang, Wei-Tsung ; Wu, Tung-Kung ; Rotomskis, Ričardas ; Steponkienė, Simona ; Lin, Hong-Cheu |
| DOI |
10.1002/adfm.202519737 |
| Full Text |
|
| Is Part of |
Advanced functional materials.. Weinheim : John Wiley and Sons Inc. 2025, Early Access, art. no. e19737, p. [1-18].. ISSN 1616-301X. eISSN 1616-3028 |
| Keywords [eng] |
mechanically interlocked molecules ; N,N′-diphenyl-dihydrodibenzo[a,c]phenazines ; polyurethane organogels ; ratiometric mechano-fluorescence emissions ; self-healing behaviors |
| Abstract [eng] |
The highly tough, self-healable, and adhesive polyurethane (PU) organogels with force-regulated ratiometric emission switching behaviors are fabricated through covalently linked cellulose nanocrystals (CNCs) as multiple hydrogen-bonded crosslinkers and N,N’-diphenyl-dihydrodibenzo[a,c]phenazine (DPAC)-modified mechanically interlocked molecules (MIMs) as artificial molecular muscles, including [2]rotaxanes (before/after shuttling) and extended/contracted [c2] daisy chain molecules with different sliding motions. Interestingly, the optimal PU organogel consisting of a small amount (ca. 1.5 wt.%) of the first DPAC-based unconventional daisy chain with the particular macrocycle-exerted force mode reveals an admirable toughness of 142 MJ m−3, which is ca. 1.6 and 2.6 times higher than the PU organogels containing [2]rotaxane and without MIMs, respectively. Besides, ratiometric mechano-fluorescence responses of MIM-based PU organogels exhibiting corresponding orange (603 nm, before shuttling or free doping) and blue (451 nm, after shuttling) emissions of the suspended DPAC stoppers as crucial in situ molecular shuttling sensors can be created by force-induced shuttling motions to constrain intramolecular vibrations of DPAC termini. Notably, the brilliant adhesive and self-healing performances together with excellent storage stabilities of MIM-based PU organogels can be verified to provide special force- and temperature-triggered fluorescence emission switches, designating prospective mechano-fluorescence and temperature sensor applications of multi-functional DPAC-based PU organogels in constructing state-of-the-art materials with multi-stimuli responsiveness. |
| Published |
Weinheim : John Wiley and Sons Inc |
| Type |
Journal article |
| Language |
English |
| Publication date |
2025 |
| CC license |
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