Hydrates of Organic Compounds. XVII. The Effect of Cations on the Formation of Hydrates of Poly(tetraisopentylammonium acrylate)

A thermal analytic method using a differential scanning calorimeter was applied to binary mixtures of water with a series of poly(tetraisopentylammonium acrylates) whose cation was partially substituted by such cations as Na+, (n-C3H7)4N+, and (n-C4H9)4N+ (Cx[(i-C5H11)4N]1−xPA; C=Na, (n-C3H7)4N, and (n-C4H9)4N; x = 0.1–0.9; PA=one unit of a polyacrylate anion). It was found that (1) when C=Na, the formation of a hydrate solid is possible, even in a system of x = 0.9, though both the dissolution temperatures and the amounts of heat absorbed to melt the hydrate solid decreased with increasing x; (2) the effect of the (n-C3H7)4N+ ion was essentially similar to that of the Na+ ion, except that the temperature at which the ice phase began to melt decreased pronouncedly with increasing x; and (3) in the case of the [(n-C4H9)4N]x[(i-C5H11)4N]1−xPA system it was concluded that the solid phase was essentially a (i-C5H11)4NPA hydrate when x was smaller than about 0.4, a (n-C4H9)4NPA hydrate when x was larger than a...

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