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Critical concentrations of polymers in solutions according to measurements of the viscosity and specific surface area of aerogels resulting after sublimation of the solvent

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Summary

Critical concentrations of polystyrene and cyclolinear polyphenylsiloxane solutions corresponding to rising of structural networks have been determined by viscosity measurements and by measurements of specific surface of aerogels obtained by solvent sublimation. Theoretical and experimental values of critical concentrations coincide. Conditions for preparation of aerogels with developed surface by sublimation drying have been determined. Dependence of aerogel specific surface on polymer concentration in solutions shows distinct maximum at critical concentration found by viscosimetric method.

Zusammenfassung

Mit Viskositätsmessungen und mittels Bestimmung der spezifischen Oberfläche an Aerogelen, erhalten durch “Sublimation” des Lösungsmittels aus Lösungen Polymerer, wurde die Existenz einer kritischen Konzentration für Polystyrol und zyklisches lineares Polyphenylsiloxan festgestellt, hervorgerufen durch Aufbau struktureller Netzwerke.

Theoretisch vorausgesagte und experimentell gefundene Werte für die kritischen Konzentrationen stimmen überein. Bedingungen für die Präparation von definierten Aerogelen mit durch Sublimationstrocknung erzielter Oberfläche wurden festgelegt. Die Abhängigkeit der spezifischen Oberflächen von Aerogel von der Polymerkonzentration in Lösung zeigt ein ausgeprägtes Maximum bei der kritischen Konzentration, die man aus den Viskositätsmessungen findet.

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Vinogradov, G.V., Titkova, L.V. Critical concentrations of polymers in solutions according to measurements of the viscosity and specific surface area of aerogels resulting after sublimation of the solvent. Kolloid-Z.u.Z.Polymere 239, 655–666 (1970). https://doi.org/10.1007/BF02085914

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