论文部分内容阅读
The fluorescent spectra of two series of sulfonated polyelectrolytes respectively labeled with dansyl and pyrenyl groups were determined as a function of volume fraction φ THF of THF in DMSO/THF mixed solvents. When φ THF 0.65, the maximum wavelength λ em and the intensity R F relative to that in DMSO for a band of dansylated samples, as well as I 1/I 3 for pyrene labeled samples varied slightly with increasing φ THF , indicating the capability of polyelectrolyte to maintain its chain solvation stable.As long as φ THF beyond 0.70, there was an abrupt drop in R F and λ em showing the sudden change in the chain solvation layer. I 1/I 3 decreased with an increase in the charge density of polyelectrolyte samples,suggesting the existence of aggregated structure even in pure DMSO.
The fluorescent spectra of two series of sulfonated polyelectrolytes respectively labeled with dansyl and pyrenyl groups were determined as a function of volume fraction φ THF of THF in DMSO / THF mixed solvents. When φ THF 0.65, the maximum wavelength λ em and the intensity RF relative to that in DMSO for a band of dansylated samples, as well as I 1 / I 3 for pyrene labeled samples anu slightly φ with increasing φ THF, indicating the capability of polyelectrolyte to maintain its chain solvation stable. As long as φ THF beyond 0.70 , there was an abrupt drop in RF and λ em showing the sudden change in the chain solvation layer. I 1 / I 3 decreased with an increase in the charge density of polyelectrolyte samples, suggesting the existence of aggregated structure even in pure DMSO.