Abstract
We present preliminary measurements of the collective diffusion coefficient D of high molecular weight polystyrene in semi-dilute solution with cyclohexane at the theta temperature, using dynamic light scattering. The concentrations c used were all well in excess of the critical entanglement concentration. For small scattering angles, D ∝ c0.94±0.08. For large angles, D gives the shear (plateau) modulus of the solution. The results provide strong support for a recent theory of theta solutions due to F. Brochard.
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