Viscosity and Density of the Liquid System TNT-Picric Acid and Four Related Pure Materials

Abstract

The viscosity and density of the system TNT-picric acid and four related susbstances have been investigated over a range of temperature which included both normal and supercooled liquids. The temperaturedependence of viscosity was found to be best represented by a continuous exponential function of the type '1=A exp(B/T +C/P), which yielded a good fit to the data even well into the supercooled region. Density in each case was found to vary linearly with temperature across the entire range. The results are interpreted as arising from an inverse temperature dependence of the flow activation energy, AEvis. It is suggested that AEvis may drop to zero at sufficiently high temperature and pressure.

A note on the coefficient of viscosity of pure molten 2,4,6-trinitrotoluene (TNT)

“…We recently completed a study into the flow properties of molten 2,4,6-trinitrotoluene (TNT) and have found our values for the viscosity of molten T N T are in disagreement with those published [1,2]. We intend to publish a fuller account in the near future.…”

“…The variation of Moore et al [1] data from linearity is evidence for an inverse temperature dependence of the flow activation energy which in itself is a very interesting phenomenon. We were most concerned that our results varied widely from values calculated from the Moore et al [1] equation. A temperature inaccuracy of approximately 3 °C would be required to cause our values to overlap, which was highly unlikely.…”

“…For comparative purposes we have also included some results of Gey et al [2] and show the values of TNT viscosity predicted using the Moore et al [1] equation. It should be noted that Gey et al [2] and Moore et al…”

“…We intend to publish a fuller account in the near future. In the most complete study published, Moore et al [1] measured the viscosity of pure molten and supercooled T N T with a modified Ostwald (Cannon-Fenske) capillary viscometer and reported that the temperature dependence of viscosity of T N T was best represented by a continuous exponential function of the type l o g t / = A+ B/T + C / T 2 (1) where t/was the viscosity in c P, T was the temperature in Kelvin and A, B, and C were constants. For TNT, A = 2.78, B = -2810 and C = 7.8 x 105 .…”

Polymer Reinforced DNAN/RDX Energetic Composites: Interfacial Interactions and Mechanical Properties

“…However, because of the low density and low viscosity of DNAN [12][13][14], solid-liquid phase dislocations may appear during processing of a composite when using DNAN as the continuous phase, which will induce degradation of the solid phase, and affect the mechanical properties of the energetic composite, leading to weak dimensional stability, poor toughness and high brittleness [15][16][17]. Molecular simulations and mechanical tests of TNT and DNAN show that the compressive strength, tensile strength, shear strength and plastic deformation of DNAN are all lower than those of TNT, thus DNAN is more prone to brittle fracturing compared with TNT [18].…”