Abstract
Excess isobaric heat capacities C Ep , densities π and speeds of sound u of HMPA+heptane and+benzene were measured at 25°C. C Ep of both mixtures were positive in the range of small x and negative in the other region. The mixture containing benzene showed higher C Ep than the heptane mixture. They both exhibited considerably smaller C EV than C Ep . VE was positive for HMPA+heptane and negative for HMPA+benzene. The compressibilities K Es and K Ep of both mixtures were negative. In both mixtures, non-random mixing is expected and [(CH3)2N]3PO molecules are inhomogeneously distributed.
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Tamura, K., Murakami, S., Fukumori, M. et al. Thermodynamic properties of binary mixtures: Hexamethylphosphoric triamide (HMPA) with a non-polar liquid at 25°C. J Solution Chem 23, 989–996 (1994). https://doi.org/10.1007/BF00974099
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DOI: https://doi.org/10.1007/BF00974099