|Title||CONCENTRATION AND TEMPERATURE-DEPENDENCE OF MOLECULAR MOTIONS IN POLYSTYRENE TETRAHYDROFURAN SOLUTIONS|
|Publication Type||Journal Article|
|Year of Publication||1992|
|Authors||Johnson, B. S., M. D. Ediger, Y. Yamaguchi, Y. Matsushita, and I. Noda|
|Type of Article||Article|
|Keywords||ANISOTROPY, BULK, CIS-POLYISOPRENE, DIELECTRIC-RELAXATION, DIFFUSION, FLUORESCENCE, FLUORESCENCE ANISOTROPY DECAY, FRICTION, NORMAL-MODE PROCESS, POLYMER-SOLUTIONS, POLYSTYRENE, PROBE DIFFUSION, SEGMENTAL DYNAMICS, SELF-DIFFUSION, SOLUTION DYNAMICS, TOLUENE|
The fluorescence anisotropy decay method is used to measure the rotational diffusion of 9,10-diphenylanthracene and the segmental motion of anthracene-labelled polystyrene in tetrahydrofuran solutions of polystyrene. The concentration dependences of these two measures of microscopic friction are reported from pure solvent to 70% polymer at 4.5, 25.0 and 45.5-degrees-C. These results are compared to previously reported measurements of the translational diffusion of methyl red in the same system, and to the temperature dependence of the solution viscosity of a closely related system. The three measures of microscopic friction show similar concentration dependences.