Polymer translational diffusion: 2. Non-theta solutions, polystyrene in butan-2-one

The diffusion of linear polystyrene under non-theta conditions in butan-2-one has been studied by Rayleigh light scattered linewidth measurements for the molecular weight range of 2.08 × 10 6 to 8.7 × 10 6 and as a function of concentration. By extrapolation of diffusion coefficient values to zero c...

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Bibliographic Details
Published in:Polymer (Guilford) 1973-01, Vol.14 (7), p.293-296
Main Authors: King, T.A., Knox, A., McAdam, J.D.G.
Format: Article
Language:English
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Summary:The diffusion of linear polystyrene under non-theta conditions in butan-2-one has been studied by Rayleigh light scattered linewidth measurements for the molecular weight range of 2.08 × 10 6 to 8.7 × 10 6 and as a function of concentration. By extrapolation of diffusion coefficient values to zero concentration we find that D 0 = 5.5 × 10 −4 M ̄ −0.561 w cm 2 s −1 . The first order concentration dependence k d c changes sign as the molecular weight increases, k d being fairly small and negative at low molecular weights and increasingly positive above M ̄ w⋍230 000 .
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(73)90120-1