Concentration dependence of diffusion coefficient at various molecular weights and temperatures |
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| Authors: | Charles C Han A Ziya Akcasu |
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| Affiliation: | Center for Materials Research, Polymer Science and Standards Division, National Bureau of Standards, Washington, D.C. 20234, USA;Department of Nuclear Engineering, The University of Michigan, Ann Arbor, Michigan, 48109, USA |
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| Abstract: | The effect of temperature on the concentration dependence of the diffusion coefficient D(c) is investigated experimentally by light scattering using polystyrene with Mw = 179 000 and 900 000 in toluene and cyclohexane at several temperatures. It is found that D(c) decreases with concentration under the theta condition, and increases in good solvents. The continuous transition from theta (θ) to good solvent behaviour is explored, and the results are compared with the existing theoretical predictions. |
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