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Unperturbed Dimensions of Polymers in Binary Solvent Mixtures

✍ Scribed by A. Dondos; H. Benoit

Publisher
Elsevier Science
Year
1968
Tongue
English
Weight
477 KB
Volume
4
Category
Article
ISSN
0014-3057

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✦ Synopsis

Intrinsic viscosity measurements were carried out on polystyrene and polyvinylpyridine solutions in various solvents and solvent mixtures. The Stockmayer-Fixman extrapolation was applied to the date: it yields the unperturbed dimensions K s of the chain. A unique value of K e was found for a given polymer in all pure solvents, as expected; in the case of binary mixtures, the K s value is found higher or lower than this unique value, depending upon the thermodynamic parameter xt 2 characterizing the solvent mixture, According to these results, the properties of 0-solutions (as defined classically for pure solvents) should not be extended to ternary systems, since K 0 does not depend solely on temperature.

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