標題: Chain dynamics of concentrated polystyrene solutions studied by depolarized photon-correlation and viscosity measurements
作者: Lai, CS
Juang, JH
Lin, YH
應用化學系
Department of Applied Chemistry
公開日期: 8-May-1999
摘要: Concentrated solutions of nearly monodisperse polystyrene samples in cyclohexane in the theta condition and in the entanglement-free region have been studied by means of the depolarized photon-correlation spectroscopy and viscosity measurements. It is shown that the viscoelastic behavior of the studied systems is described by the Rouse theory and that in agreement with the theoretical analysis the main polymer dynamic process probed by the depolarized Rayleigh scattering is basically the reorientational motion associated with a Rouse segment of the polymer chain, whose relaxation is independent of the scattering angle and the molecular weight. In addition to the main dynamic process, the tail region of a very fast process associated with the sub-Rouse-segmental motions can be observed, whose existence is expected from the theoretical analysis. (C) 1999 American Institute of Physics. [S0021-9606(99)51817-5].
URI: http://hdl.handle.net/11536/31341
ISSN: 0021-9606
期刊: JOURNAL OF CHEMICAL PHYSICS
Volume: 110
Issue: 18
起始頁: 9310
結束頁: 9318
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