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Surface tension of polymer solutions, 5.

Temperature dependence of surface tension of polystyrene-decalin and cyclohexane, polymethylmethacrylate-heptanone and polyisobutylene-benzene theta-solutions.

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Summary

Surface tensions of four theta-solutions have been measured over a wide temperature range: Polystyrene-cyclohexane and decalin, polymethyl-methacrylate-heptanone-4 and polyisobutylene-benzene. Continuous surface tension measurements can only be regarded as equivalent to equilibrium measurements if, using appropriate speeds of temperature change, points of heating and cooling cycles give an identical curve. No transition can be found at the theta-temperature in this case.

Zusammenfassung

Es wurden die Oberflächenspannungen von vier Theta-Lösungen über einen großen Temperaturbereich gemessen: Polystyrol-Cyclohexan und Dekalin, Polymethylmethacrylat-Heptanon-4 und Polyisobutylen-Benzol. Kontinuierliche Oberflächenspannungsmessungen können nur dann als gleichwertig mit Gleichgewichtsmessungen betrachtet werden, wenn bei geeigneten Geschwindigkeiten der Temperaturänderung Punkte der Erhitzungs- und Abkühlungszyklen auf einer identischen Kurve liegen. In diesem Fall kann kein Übergang bei der Theta-Temperatur gefunden werden.

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Authors and Affiliations

  1. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 1000, Berlin 33/Dahlem, Deutschland

    M. Okubo & K. Ueberreiter

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  1. M. Okubo
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  2. K. Ueberreiter
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Okubo, M., Ueberreiter, K. Surface tension of polymer solutions, 5.. Colloid & Polymer Sci 256, 591–593 (1978). https://doi.org/10.1007/BF01639205

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  • DOI: https://doi.org/10.1007/BF01639205

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