Physics – Condensed Matter – Statistical Mechanics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..519..326t&link_type=abstract
STATISTICAL PHYSICS: Third Tohwa University International Conference. AIP Conference Proceedings, Volume 519, pp. 326-328 (2000
Physics
Condensed Matter
Statistical Mechanics
Stability Of Laminar Flows, Steady Shear Flows, Viscometric Flow, Order-Disorder Transformations, Statistical Mechanics Of Model Systems
Scientific paper
Chain dynamics of poly(α-mehylstyrene) of high molecular weight in benzene, a good solvent, in dilute solution was investigated by dynamic light scattering under Couette flow. At the shear gradient above 2.8-4.5 s-1, the internal modes of motions were exclusively suppressed and only the center-of-mass translational diffusion motion of the chain was detected. Whereas, in the intermediate shear region, the decay rate for the internal mode was constant but that for the diffusion mode increased with increasing the shear rate. The obtained universal ratio Ω/D0q2 was located close to the theoretical curve predicted for flexible chains under the microscopic description of chain dynamics in the Θ state. This quantitative agreement between theory and experiments means that the coupled kinetic equations for chain segments and solvent in the same dynamic level is indispensable for describing rigorously chain dynamics in dilute solution. .
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