Excluded-Volume Effects in Dilute Polymer Solutions. II. Limiting Viscosity Number
- 15 November 1968
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 49 (10), 4339-4345
- https://doi.org/10.1063/1.1669879
Abstract
Measurements of were made for seven fractions of polychloroprene (PCP) in methyl ethyl ketone, n‐butyl acetate, and carbon tetrachloride at 25°C and for three fractions of PCP in trans‐decalin at a number of temperatures ranging from 0.05° to 65°C. On a log–log graph paper, the values of calculated from these data formed a composite curve when plotted against obtained from light‐scattering experiments under the same conditions. This curve is characterized by a relatively marked upward curvature in the vicinity of the origin, followed by a linear portion of unit slope. Its initial tangent has a slope of 0.65, which is much smaller than 0.81 predicted theoretically by Kurata and Yamakawa. Plots of vs the interaction parameter were prepared by evaluating for each by use of the Yamakawa equation. They were fitted by a single curve having a slight downward curvature, suggesting that no drainage effect manifests itself in the viscosity behavior of the systems studied. This curve explains why the familiar Stockmayer–Fixman method to treat in non‐θ solvent systems works, despite the fact that, as shown previously, data for as a function of molecular weight, solvent species, and temperature can be reasonably well described by the modified Flory or by the Yamakawa equation. Recent viscosity data of Berry on polystyrene were re‐examined in terms of the present method, and it was found that his demonstration of the drainage effect on is not yet conclusive.
Keywords
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