Abstract
The translational diffusion coefficient for polystyrene in cyclohexane under theta conditions has been found to be concentration dependent, describable by an equation of the form: D( c) = D 0(1 + k D c + …), in which k D is related to the weight-average molecular weight as k D = (4·1 ± 0·3) × 10 −4 M ̄ w d dl/ g with with d = 0·48 ± 0·04. The result is intermediate between between the theoretical descriptions of: Yamakawa; Imai; and Pyun and Fixman. Diffusion coefficient measurements have been made with variation of molecular weight and concentration by detecting the linewidth of the Rayleigh light-scattered component in a laser light-scattering apparatus.
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