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

作     者：Gao, H Wang, GC He, BL 

作者机构：NANKAI UNIVSTATE KEY LAB FUNCT POLYMER MAT ADSORPT & SEPARATINST POLYMER CHEMTIANJIN 300071PEOPLES R CHINA 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：1997年第8卷第6期

页      面：543-546页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

主　　题：SCATTERING POLYMER 

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 (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.