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- W2046122394 abstract "A new kind of fluorescent hyperbranched polymers was prepared by an end-capping approach, i.e., the hyperbranched poly(hydroxyl ether) was end capped with p-N,N-dimethylaminobenzaldehyde. The resulting polymers fluoresce yellow-green in solid and in solution. The maximum excitation and emission wavelengths in ethanol are 310 ± 10 and 360 ± 10 nm, respectively. Hyperbranched polyethers with various densities of chromophore groups showed different fluorescence intensities at the same concentration of chromophore groups. The fluorescent hyperbranched polyether with a high density of chromophore groups can form intramolecular excimers. The fluorescence signal of the resulting polymer increases with pH and passes through a maximum at 7.2–8.5 and then decreases gradually. Furthermore, the peak at 360 nm shifts to 405 nm with increasing pH. The fluorescence can be quenched by transition metal cations such as Cu2+ and Fe3+, while the alkali and alkaline earth metal cations and Ni2+ and Co2+ have little effect on the fluorescence intensity." @default.
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- W2046122394 date "2004-01-01" @default.
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- W2046122394 title "Preparation and characterization of fluorescent hyperbranched polyether" @default.
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- W2046122394 doi "https://doi.org/10.1016/j.reactfunctpolym.2003.09.004" @default.
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