ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The thermodynamic properties of the polyoxypropylene glycol fractions in methanol, experimentally determined as described in Part I, have been examined in terms of various statistical mechanical theories. The Flory-Huggins interaction parameter χ has been calculated and enthalpic and entropic components of χ deduced from the experimental data. Deviations from the Flory-Huggins theory are discussed. The thermodynamic excess functions for free energy and entropy of mixing are calculated, and it is concluded that strong orientation effects are operative in the polymer-solvent interaction, presumably through hydrogen bonding with the solvent. The hydroxylic endgroups on the short chain fractions play an important role in determining the thermodynamic behavior of the solutions. The role of orientation effects is examined by calculating the partial molar heat content and the partial molar entropy of the solvent and applying the theory of Münster for polymer solutions in which solvent orientation effects are operative. A semiempirical treatment, less arbitrary than that used by Münster, gives satisfactory results for polymer fractions of M. W. 150 and 1120.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1960.1204614709
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