A series of chalcone-containing copolymers with the solvent and temperature dual responsive fluorescence were synthesized by the radical copolymerization of N-isopropylacrylamide(NIPAM) and 4-methacryloyloxy4′-dimethylaminochalcone(DMAC) in THF solution using AIBN as initiator

and their structures were confirmed by FTIR

1H\|NMR and UV-Vis spectroscopy.The chalcone content in the copolymer was determined by UV-Vis absorbance method.The thermosensitivity of chalconecontaining copolymers and their solvent and temperature dual responsive fluorescence were investigated.The results show that the as-synthesized chalconecontaining copolymers are a kind of thermosensitive polymers with a lower critical solution temperature (LCST) and the LCST of the copolymer decreases with the increase of the chalcone content in the copolymer.With the increase of the solvent polarity

both the maximum absorption wavelength and the fluorescence emitting wavelength of the chalconecontaining copolymers red\|shifts

and the intensity of fluorescence first increases

then decreases

which exhibits solvent polarity sensitive fluorescence properties.Comparing the fluorescence of the copolymer aqueous solution at different temperatures

it is found that at high temperature the fluorescence of the copolymer has been enhanced

which endows the chalcone-containing copolymers with the reversible temperature “on/off” fluorescence properties.