摘要
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 (CPS～0.32, 0.82g/ml) have been observed from the log-log plot of IE/IM vs CPS. The results are explained in terms of the onset of cohesional interaction and the glass transition of the polymer chains.
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)similar to 0.32, 0.82g/ml) have been observed from the log-log plot of IB/IM vs C-PS. The results are explained in terms of the onset of cohesional interaction and the glass transition of the polymer chains, respectively.
