Citation: Huan GAO, Guo Chang WANG, Bing Lin HE. Critical Transitions of Microviscosity in Concentrated Polystyrene Solutions Revealed by Excimer Formation of Pyrenyl Probes[J]. Chinese Chemical Letters, ;1997, 8(6): 543-546. shu

Critical Transitions of Microviscosity in Concentrated Polystyrene Solutions Revealed by Excimer Formation of Pyrenyl Probes

The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation and Institute of Polymer Chemistry, Nankai University, Tianjin 300071

Received Date: 17 December 1996

Excimer formation of pyrene and benzyl 4-(1-pyrenyl) butanoate was used to study the microviscosity of polystyrene/toluene solutions over the entire concentration range.Two critical concentrations (C_PS~0.32,0.82g/ml) have been observed from the log-log plot of I_E/I_M vs C_PS.The results are explained in terms of the onset of cohesional interaction and the glass transition of the polymer chains,respectively.
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