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Citation: Gao Feng, Ren Bi-Ye, Yan Yu, Tong Zhen. Changes in Solvation State of Strong Polyelectrolytes in DMSO/THF Mixtures[J]. Acta Physico-Chimica Sinica, ;2000, 16(05): 450-453. doi: 10.3866/PKU.WHXB20000515 shu

Changes in Solvation State of Strong Polyelectrolytes in DMSO/THF Mixtures

1.
Research Institute of Materials Science,South China University of Technology,Guangzhou 510640

Received Date: 12 July 1999
Available Online: 15 May 2000

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.
- Dansyl,
- Pyrene,
- Polyelectrolyte,
- Solvation,
- Fluorescent spectra
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