The design and properties study of a novel styryl-pyridinium-based water-soluble fluorescent copolymer as tracing agent

摘要： A water-soluble ?uorescent copolymer poly(acrylamide-acrylic acid-styrene pyridinium) (PAAS) for detecting polymer concentration in real time was synthesized via micellar free-radical polymerization by acrylamide, acrylic acid, and styryl-pyridinium salt derivative (SP-4). The special Donor-π-Acceptor unit and ionic structure of SP-4 endued the copolymer with excellent ?uorescent properties and remarkable water solubility. The ?uorescent copolymer was fully characterized by Fourier transform infrared, 1H nuclear magnetic resonance, thermogravimetry, Ubbelohde viscosity, ultraviolet–visible spectroscopy, and ?uorescence measurements. Furthermore, the ?uorescence intensity and the concentration of PAAS were veri?ed to have ideal linear relationship with a correlation coef?cient up to 0.9993, indicating that the copolymer’s concentration can be easily measured by detecting its ?uorescence intensity. Most importantly, the introduction of water-soluble ?uorescent monomer SP-4 endowed the PAAS with good ?uorescent stability in a wide range of temperature, pH, and brine concentrations. This study demonstrated that the ?uorescent copolymer PAAS exhibits great potential application in detecting polymer concentration in various environments.