標題: | Dynamics of a ''Rouse'' segment as probed by depolarized photon-correlation and viscoelasticity measurements |
作者: | Lin, YH Lai, CS 交大名義發表 應用化學系 National Chiao Tung University Department of Applied Chemistry |
公開日期: | 15-七月-1996 |
摘要: | A polystyrene melt, whose molecular weight (weight-average molecular weight = 1050) is about that estimated for a Rouse segment;, has been studied with depolarized photon-correlation and viscosity measurements. Theoretically the dynamic depolarized light scattering is shown to be affected by the reorientational motion of the whole polymer molecule in the long-time region and the local segmental motions in the short-time region. The elastic dumbbell model is used to describe the viscoelasticity and reorientational motion of the polymer molecule. Relaxation times [tau] and tau(v) are extracted from the depolarized light scattering and viscosity measurement results, respectively. The ratio tau(v)/[tau], being independent of temperature as expected, is of the order of magnitude predicted from the theoretical analysis. We come to a similar conclusion supporting the above results by analyzing the depolarized photon-correlation results and the viscoelastic relaxation data in the glass-rubber transition zone of entangled polystyrene melts, which are available in literature. |
URI: | http://hdl.handle.net/11536/1162 |
ISSN: | 0024-9297 |
期刊: | MACROMOLECULES |
Volume: | 29 |
Issue: | 15 |
起始頁: | 5200 |
結束頁: | 5207 |
顯示於類別: | 期刊論文 |