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Abstract

The eutectic ternary phase diagrams of some typical volatilizable energetic materials have been investigated by high pressure differential scanning calorimeter (PDSC). The ternary HX phase diagrams for TNT/TNAZ/DNTF (TTD) and TNAZ/DNTF/RDX (TDR) systems were constructed by the correlation of the apparent fusion heat with the composition (HX method). And, the ternary TX phase diagrams (the temperature dependence on composition) for the two ternary systems were constructed by calculating from the data of the five TX binary phase diagrams. The eutectic compositions (mol%) of TTD and TDR ternary systems were obtained to be 52.3/27.3/20.4 (HX method), 53.2/25.8/21.0 (TX method) and 54.9/39.6/5.5 (HX method), 55.1/42.2/2.7 (TX method), respectively. The eutectic temperatures of the ternary systems were obtained by PDSC determination and TX method calculation to be 76.5 and 76.7 °C, 47.5 and 50.2 °C, respectively. It is shown that the results obtained by two methods are in agreement and the error in measuring or calculating eutectic compositions and temperatures for the two ternary systems are within allowable ranges of ±3 mol% and ±3 °C, respectively. Moreover, by means of constructing two ternary HX phase diagrams with different fixed composition of a component and comparing the apparent fusion heat of eutectics with calculated one, the results obtained from HX method for TTD system were proved. The results showed that the gasification or volatilization of easy volatile materials could be efficiently restrained by high pressure atmosphere, and the perfectly and ideally HX ternary phase diagrams can be constructed. In comparison with TX method, HX method has as a virtue of being quick and simple, especially on constructing ternary phase diagram.

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.0 (methyl carbon atoms) and δ 34.0 (quaternary carbon atom)] NMR spectra of Fyrquel EHC. At higher temperature in air Fyrquel EHC does evolve volatile products. The infrared spectrum of the volatile material is displayed in Fig. 12

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been proposed in many studies [ 19 , 20 ] that the higher heating fluxes in the high heating period decreased the viscosity of the decomposing biomass material, thus enhancing the depolymerization reactions to form higher yields of volatile materials

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Journal of Thermal Analysis and Calorimetry
Authors: R. A. Candeia, F. S. M. Sinfrônio, T. C. Bicudo, N. Queiroz, A. K. D. Barros Filho, L. E. B. Soledade, I. M. G. Santos, A. L. Souza, and A. G. Souza

viscosity change, the breakage of the ester chains, release of volatile products, and oxidation of ester chains and polymerization of non-volatile materials [ 31 , 32 ]. In this study, oxidation and polymerization were more pronounced than the other two

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observed that the activation energy of the first step during combustion is little more than that of pyrolysis in the first step while the activation energy in the second step for fixed carbon combustion is larger than the first step for volatile material

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products of pyrolysis. Thermogravimetric analyser coupled with Fourier transform infrared spectrometer (TG-FTIR) is a useful tool in dynamic analysis as it monitors continuously both the weight of the non-volatile materials (residue) and the time

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coal–pharmaceutical sludge blends decomposition process. The pyrolysis of pharmaceutical wastewater sludge was different from that of coal, volatile materials being given off at lower temperatures. The coal–pharmaceutical wastewater sludge blends showed

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], which is a way to produce combustible volatile materials and char residue from natural products. In this study, biomass samples were measured under inert and oxidative atmospheres by thermogravimetry/mass spectrometry. Thermal behaviours of woody, non

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mass loss below 131 °C. In Fig. 2 , three phases of mass loss can be observed: the first phase begins from 130, 140 and 190 °C for COO, JAO and CRO, respectively and extends to 265 °C which corresponds with the evaporation of more volatile materials in

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Thermal degradation involves reactions of the solid-state type, which, given the origin of the solid and volatile materials and the difference of the other degradation processes, occurs in the bulk of the polymers [ 31 ]. Such reactions take place by one

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