4.7 Article

Hydrogen-Bonding-Induced Clusteroluminescence and UCST-Type Thermoresponsiveness of Nonconjugated Copolymers

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MACROMOLECULES
卷 -, 期 -, 页码 -

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AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.2c01531

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资金

  1. National Natural Science Foundation of China
  2. CAMS Innovation Fund for Medical Sciences
  3. [22075154]
  4. [21604044]
  5. [2021-I2M-1-058]

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Nonconjugated luminescent polymers with an upper critical solution temperature (UCST) in aqueous solution have been synthesized through copolymerization of a strong hydrogen-donating monomer, acrylic acid (AAc), and a strong hydrogen-accepting monomer, N-vinylcaprolactam (NVCL). The polymer demonstrates improved clusteroluminescence and thermoresponsiveness, making it suitable for temperature-sensitive biosensing applications.
Stimuli-responsive light-emitting polymers (SRLEPs) have many promising applications. However, the synthesis of SRLEPs from nonconjugated and water-soluble monomers remains a challenge. Herein, for the first time, nonconjugated luminescent polymers with an upper critical solution temperature (UCST) in aqueous solution are reported. The polymer is synthesized through copolymerization of a strong hydrogen-donating monomer, acrylic acid (AAc), and a strong hydrogen-accepting monomer, N-vinylcaprolactam (NVCL). The polymer-polymer hydrogen-bonding rigidifies the chain conformation and enhances the clustering of the heteroatoms and carbonyl groups, resulting in an improved clusteroluminescence. Meanwhile, the polymer-polymer hydrogen bonding also brings in dynamic chain association that can be switched with temperature, yielding a UCST-type thermoresponsiveness in aqueous solution. This work demonstrates a novel and facile method of designing SRLEPs through tailoring the hydrogen bonds in the polymer. The properties of clusteroluminescence and thermoresponsiveness of the AAc-NVCL copolymers may render themselves with applications as temperature-sensitive biosensing.

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