Tailoring the Phase Transition and Luminescence Behaviors of a Poly(ionic liquid) to Ensure Visual Temperature Sensing AITranslate

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DOI：https://doi.org/10.1021/acsapm.1c01198

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The thermo-responsive and fluorescent nature of a poly(ionic liquid) (PIL) is tailored by reversible addition-fragmentation transfer (RAFT) copolymerization of 2-(dodecylthiocarbonothioylthio)-2-methylpropionic acid (DDMAT) and ionic liquid tetrabutylphosphonium styrenesulfonate ([P4444][SS]). The PIL is shortly termed as poly([P4444][SS]-DDMAT). In this strategy, DDMAT plays the following multiple functions: (1) it serves as an RAFT reagent to ensure precise control of the molecular weight of PIL; (2) its dodecyl chain is grafted at the chain end of PIL to reduce the cloud point temperature (Tcp); and (3) it regulates the fluorescence properties of PIL to induce a redshift of the emission. The Tcp of PIL decreases with the increment of its molecular weight and concentration, while it increases with the enhancement in pH and salt level. PIL displays blue-green fluorescence (λex/λem = 392/478 nm) in an aqueous medium with a quantum yield (Φ) of 0.86% and a lifetime (τ) of 1.09 ns. It also shows thermo-responsive fluorescence activity. Its phase transition temperature from clear to turbid is tailored into a range covering the physiological temperature. The variation of temperature within a certain range is made to be visually visible based on the degree of turbidity, which well ensures skin surface temperature sensing and facilitates preliminary diagnosis of fever.