Abstract
A thermal method using differential scanning calorimeter has been applied to aqueous solutions of a series of poly(tetraalkylammonium ethenesulfonates) (R4NPES). It was found that only the salts withR=n-C4H9 andR=i-C5H11 could form stable hydrates having large hydration numbers. The melting point and hydration numbers of these two hydrates were 12.0°C and 30±1 for the (n-C4H9)4NPES hydrate and 16.0°C and 53±2 for the (i-C5H11)4NPES hydrate, respectively. It was concluded that these hydrates were clathrate-like essentially similar to such hydrates as (n-C4H9)4NF·30H2O and (i-C5H11)4NF·40H2O.
Zusammenfassung
Unter Einsatz eines Differential-Scanning-Kalorimeters wurde eine thermoanalytische Methode an wäßrigen Lösungen einer Reihe von Poly(tetraalkylammoniumethensulfonat)-en (R4NPES) angewendet. Man fand, daß nur die Salze mitR=n-C4H9 undR=i-C5H11 stabile Hydrate mit hoher Hydratationszahl bilden können. Der Schmelzpunkt und die Hydratationszahl für diese beiden Hydrate beträgt 12.0°C und 30±1 für (n-C4H9)4NPES Hydrat und 16.0°C und 53±2 für (i-C5H11)4NPES Hydrat. Man zog die Schlußfolgerung, daß diese Hydrate klathratähnliche Verbindungen, ähnlich wie solche Hydrate wie (n-C4H9)4NF30H2O und (n-C5H11)4NF·40H2O sind.
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Nakayama, H., Yamanobe, M. & Baba, K. The confirmation of the formation of clathrate-like hydrates of poly(tetrabutylammonium ethenesulfonate) and of poly(tetraisopentylammonium ethenesulfonate). Journal of Thermal Analysis 40, 445–451 (1993). https://doi.org/10.1007/BF02546613
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DOI: https://doi.org/10.1007/BF02546613