Abstract
The data of density and viscosity for binary mixtures of N-methylpiperazine (NMP) with methylcyclohexane (MCH) or n-heptane have been measured from T = 298.15 K to T = 313.15 K at atmospheric pressure. Excess volume, VmE, for the binary mixtures are then calculated. Positive values of VmE are observed over the entire composition range, and the maximum value is 0.622 cm3·mol−1 at 313.15 K. The excess results are discussed in terms of the changes of molecular interactions in the mixtures, and the data of VmE are fitted against the composition with the Redlich−Kister type equation. The viscosities have also been correlated with several semiempirical equations. These physical property data and calculations provide valuable information on the development and application of piperazine derivatives.
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