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Keywords:

  • living radical polymerization (LRP);
  • N-isopropylmethacrylamide;
  • pH;
  • reversible addition–fragmentation chain transfer polymerization;
  • sensors;
  • stimuli-sensitive polymers;
  • temperature

Abstract

Simple-structured copolymer, poly(NIPMAM-co-CPMA), consisting of N-isopropylmethacrylamide (NIPMAM) and (Z)-4-(1-cyano-2-(4-(dimethylamino) phenyl)vinyl)phenylmethylacrylate (CPMA) units as thermo- and pH-responsive fluorescent signaling parts, respectively, has been synthesized by reversible addition–fragmentation chain transfer polymerization. The copolymer PCN250 (m/n = 250) shows absorbance enhancement or decrease at different pH value. However, the fluorescence intensity of this copolymer shows enhancement with a rise in temperature regardless of pH value in the range of pH = 4–10. In addition, fluorescence suppression of copolymer (PCN250) was observed with high proton concentration. Moreover, the lower critical solution temperature of the copolymers, poly-(NIPMAM-co-CPMA), with different component was also investigated. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012