A novel benzoxazole-containing poly(N-isopropylacrylamide) copolymer as a multifunctional sensing material

Chang Chung Yang, Yanqing Tian, Ching Yi Chen, Alex K.Y. Jen, Wen Chang Chen

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


We report a novel multifunctional material, poly(N-isopropylacrylamide) (PNIPAAm) containing 2-(2-hydroxyphenyl)benzoxazole (HPBO), for sensing pH, zinc ion concentration, or temperature. By titration with zinc ions, a clear blue-shifted emission with a high quantum efficiency was detected since the zinc complex prevented the nonradiative decay pathways of the HPBO moiety. The fluorescence characteristics of the copolymer were similar at various acidic or neutral conditions. However, a large blue shift on the emission maximum was exhibited under the basic condition, due to the disruption of the ESIPT process by the phenolate anion. The LCST affected the fluorescence properties significantly at the basic condition because the incompatibility between the PNIPAAm chain and phenolated HPBO moieties resulted in aggregation formation. The present study demonstrates that the new benzoxazole-containing PINPAAm copolymer could be potentially used as multifunctional sensing material.

Original languageEnglish (US)
Pages (from-to)894-899
Number of pages6
JournalMacromolecular Rapid Communications
Issue number7
StatePublished - Apr 2 2007
Externally publishedYes


  • Benzoxazole
  • Fluorescence
  • Stimulisensitive polymers
  • Zinc

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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