聚苯乙烯
荧光相关光谱
扩散
聚合物
高分子
示踪剂
光谱学
化学
荧光
分析化学(期刊)
荧光光谱法
化学物理
基质(化学分析)
甲苯
材料科学
高分子化学
热力学
分子
有机化学
色谱法
光学
物理
生物化学
量子力学
核物理学
作者
Ute Zettl,Matthias Ballauff,Ludger Harnau
标识
DOI:10.1088/0953-8984/22/49/494111
摘要
We discuss the manner in which the dynamics of tracer polystyrene chains varies with the concentration of matrix polystyrene chains dissolved in toluene. Using fluorescence correlation spectroscopy and theory, it is shown that the cooperative diffusion coefficient of the matrix polystyrene chains can be measured by fluorescence correlation spectroscopy in the semidilute entangled concentration regime. In addition the self-diffusion coefficient of the tracer polystyrene chains can be detected for arbitrary concentrations. The measured cooperative diffusion coefficient is independent of the molecular weight of the tracer polystyrene chains because it is a characteristic feature of the transient entanglement network.
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