Citation: Xin Song LI, Guo Chang WANG, Bing Lin HE. Entanglement of Polymer Chains in Concentrated Region by Fluorescence Probe Technique[J]. Chinese Chemical Letters, ;1999, 10(9): 795-798. shu

Entanglement of Polymer Chains in Concentrated Region by Fluorescence Probe Technique

1.
Department of Chemical Engineering, Southeast University, Nanjing 210096;
2.
Institute of polymer Chemistry, Nankai University, Tianjin 300071

Received Date: 19 April 1999

Fund Project: The authors thank the National Natural Science Foundation of China and Talent Foundation of Southeast University for financial supports.

The fluorescence of polystyrene labeled with pyrenyl groups has been investigated in concentrated solutions.The ratio of excimer to monomer intensities (l_c/1_m) of pyrenyl labets is Found to vary with inereasing polymer concentration (C) and display fractional dependence on the C. A critical concentration, C_m at about 0.32g/ml, is first manifested. The results arc interpreted by interchain interaction and entanglement of polymer chains.
- Fluorescence spectroscopy,
- entanglement,
- critical concentration
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