Concentration dependence of the Flory-Huggins parameter at different thermodynamic conditions

By means of data from critical demixing and vapour pressure measurements and by inverse gas chromatography, including the results of published light scattering measurments, a consistent picture is obtained for the entire dependence of the Flory‐Huggins parameter χ on the weight fraction w2 of the po...

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Bibliographic Details
Published in:Die Makromolekulare Chemie 1984-10, Vol.185 (10), p.2169-2181
Main Authors: Schotsch, Kurt, Wolf, B. A., Jeberien, Hans-Edwin, Klein, Joachim
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
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Summary:By means of data from critical demixing and vapour pressure measurements and by inverse gas chromatography, including the results of published light scattering measurments, a consistent picture is obtained for the entire dependence of the Flory‐Huggins parameter χ on the weight fraction w2 of the polymer and on the temperature T for the system tert‐butyl acetate/polystyrene. Within the entire T‐range (ca. 0°C – 140°C), χ increases stronger than exponentially with w2, the rise being the larger the larger χH (the enthalpy contribution to χ) becomes in the limit of infinite dilution. At sufficiently high temperatures (≳ 50°C), χH changes its sign from negative to positive as w2 is raised. This behaviour, as well as the general shape of χ(w2) is in qualitative accord with the results of the corresponding‐states theory as developed by Flory et al.
ISSN:0025-116X
0025-116X
DOI:10.1002/macp.1984.021851012