✦ LIBER ✦

A system-independent correlation between the enthalpy and the entropy of dilution for polymer solutions

✍ Scribed by M.D. Lechner; G.V. Schulz

Publisher: Elsevier Science
Year: 1973
Tongue: English
Weight: 481 KB
Volume: 9
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(73)90004-9

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✦ Synopsis

The second osmotic virial coefficient (A2) and its entropic and enthalpic parts (Az.s and Az.u) have been determined, by means of light-scattering measurements, for solutions of polystyrene, polymethylmethacrylate and cellulose nitrate of different molecular weights in 19 solvents. A distinct qualitative correlation exists between A2 and Az.n and between A2.s and A2.n. The elimination of the "geometric" parameters of the polymer, by dividing these coefficients by suitably chosen reduction parameters, shows that the reduced coefficients obtained .42 ° and .42.s ° are predominantly functions of the reduced enthalpy coefficient A2.n °.

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