Heat Of Decomposition Research Articles

Design of three dimensional flower-like MXene/manganese-cobalt spinel nanocomposites for efficient catalytic thermal decomposition of ammonium perchlorate

A series of MXene/MnCo2O4.5 nanocomposites was successfully prepared by hydrothermal, ice crystal template and physical blend methods, respectively. Various characterizations indicated that hydrothermal method could successfully loaded MnCo2O4.5 nanoparticles on the surface of MXene nanosheets to obtain MMC-W nanocomposites with 3D flower-like structure, which could give MMC-W large specific surface area. The HTD temperature and decomposition heat of AP with adding 2.0 wt% MMC-W could significantly decrease to 304.7 °C and increase to 1310.9 J g-1, respectively. The lowest decomposition temperature (286.1 °C) and the highest heat release (1427.6 J g-1) of AP could be obtained by adding 8.0 wt% and 4.0 wt% of MMC-W, respectively. Moreover, MMC-W (2.0 wt%) could also significantly reduce the Ea of pure AP by 118.3 kJ mol-1 and increase the k value for AP by 11.2 times. The excellent catalytic performance of MMC-W was owing to the synergistic effect of nano-sized MnCo2O4.5 and MXene nanosheets. Owing to its high catalytic activity, MMC-W would be used as an excellent catalyst for ameliorating AP decomposition and supply an idea for the preparation of novel metal oxide nanoparticles.

Making Charcoal Water Electrodes

Charcoal is the residual waste from the heat decomposition process of carbon-containing materials, most of whose components are carbon. This study aims to determine the frequency of charcoal water as an electrolyte solution to produce an alternative energy source that is environmentally friendly. The method used in the experiment is to find the type of water with the addition of zinc and copper and to measure the sample voltage of charcoal water to determine the optimum mass and optimum interaction time. The variation in the volume of water with 50 ml and 100 ml of charcoal water was produced, with the addition of zinc and copper in the size of 1x5 cm, 2x5 cm, 3x5 cm which resulted in fluctuations in each data. For example, the difference in voltage value in the type of water used is tap water, 100 ml well water with the addition of zinc and copper measuring 2x5 cm. Tap water, namely with an electric voltage of 0.65 V, 0.70 V, 0.60 V, 0.60 V, 0.75 V and well water with an electric voltage of 0.60 V, 0.55 V, 0.55 V, 0.55 V, 0.55 V. Less than the maximum frequency produced with two glasses that are not made into a series or parallel circuit.

Insights into high CO-SCR performance of CuCoAlO catalysts derived from LDH/MOFs composites and study of H2O/SO2 and alkali metal resistance

Selective catalytic reduction of NOx with CO technology (CO-SCR) is deemed to be a valid and economical solution for NOx abatement. Currently, developing CO-SCR catalysts with better performance for boosting NOx purification is imperative but still lacking. Moreover, H2O/SO2 and alkali metal poisoning of CO-SCR catalysts are still austere challenges. Herein, we have elaborately designed Cu and Zn modified CoAlO catalysts by heating decomposition of LDH/MOFs composite precursors. The physicochemical property, denitration performance, anti-K, anti-H2O and anti-SO2 poisoning ability of catalyst were systematically investigated. Catalytic tests showed that the CuCoAlO catalyst achieved 99.1% NO conversion at 200 °C, and maintained excellent long-term catalytic stability. The strong synergistic interaction between Co and Cu leads to stronger redox property and abundant surface active oxygen species, and brings the outstanding deNOx performance. Impressively, the CuCoAlO catalyst displayed splendid water and alkali resistance which exhibited great potential in practical application. The catalytic and SO2-deactivation mechanisms were investigated by in situ FTIR spectra and DFT analysis, demonstrating that the nitrates and weak carbonate species are the main intermediates. SO2 hindered the SCR reaction by competing with NO for adsorption sites. This work provides a new strategy for the design and fabrication of low temperature CO–SCR catalysts and will be favorable to academic and practical applications in the future.

Thermal analysis of multi-walled carbon nanotubes doped glass fiber reinforced polymer composites

Thermal characterization is one of the important aspects for evaluating the heat flux and decomposition kinetics of different materials, alloys and composites at different temperature. In this work Multi-scale nano-composites (MWCNTs/glass fiber/epoxy) were prepared by hand lay-up process followed by vacuum bagging method. Thermal properties of MWCNTs doped glass fiber reinforced polymer composites were evaluated by differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA) and differential thermal analysis (DTA). It has been found that in the presence of MWCNTs it is very difficult to break the polymeric chains and that leads to reduction in cross linking density and glass transition temperature of MWCNTs doped glass fiber reinforced polymer composites as compared to pristine one.

Combustion promotion and agglomeration reduction of the composite propellant using graphene

Graphene and its composites are promising catalysts for energetic materials. In order to realize the application of graphene in solid propellant, the effects of graphene content on the ignition, combustion and agglomeration characteristics of composite propellant were thoroughly conducted based on thermogravimetric-differential scanning calorimetry measurements (TG-DSC), laser ignition, combustion diagnoses, burning rate test and condensed combustion products collection. Results show that graphene effectively promotes the thermal decomposition of AP. 3 wt.% graphene advances the thermal decomposition temperature of AP by 68.3 °C, and 1 wt.% graphene increases the apparent decomposition heat of AP by 2.6 times. Laser ignition experiments show that the combustion intensity and mass burning rate increase, while the ignition delay time decreases with increasing graphene content. The addition of graphene is found to increase the burning rate at 0.1 MPa, but the effect is not obvious at 1-7 MPa, thus reducing the pressure exponent. 0.5 wt.% graphene can reduce the pressure exponent from 0.43 to 0.34. Compared with the baseline propellant, more aluminum particles are ignited on the surface of the propellant containing graphene and the large size agglomerates in the condensed combustion products decrease significantly. Overall, graphene plays a comprehensive effect on the ignition, combustion and agglomeration characteristics of aluminized propellant. Results of this study can help guide the application and development of graphene or graphene-inclusion materials in solid propellant for solid rocket motors.

A new approach to the assessment of changes in air permeability, waterproofness, surface, and thermal properties of polyamide 6.6 fabric with polyurethane coating after washing

The research aim was to analyse the changes in the air permeability, waterproofness, surface, mechanical and thermal properties of the polyamide 6.6 fabric with a polyurethane coating before and after 1, 5, and 10 washes in the same conditions using specialized (V1) and universal (V2) laundry detergent. A new approach based on SEM and DSC techniques and assessment of surface free energy combined with standard methods was proposed to explain the nature of observed changes in waterproof and breathable material after washing treatment. SEM analysis indicated that after 10 washes the porosity of the polyurethane coating increased from 8.94% to 14.56% and 18.75% for V1 and V2, respectively. The air permeability increased from 0.747 mm/s for the reference sample to 0.766 mm/s and 0.774 mm/s after 10 washes for V1 and V2, respectively. The waterproofness of the reference sample of 992 mbar decreased with the increasing number of washes to 246 mbar and 122 mbar for V1 and V2, respectively. After 10 washes the surface free energy (γS) decreased by 18.8% and 24.3% for V1 and V2, respectively. The average tensile strength amounted to 833 N and decreased by 13.5% for V1 and by 20% for V2 after 10 washes. The glass transition temperature of the reference fabric was 47.6°C. After 10 washes it increased by 7.2°C and 8.8°C for V1 and V2, respectively. The temperatures of thermal degradation increased by 24.6°C and 22.2°C and the heat of thermal decomposition decreased by 23.6% and 15.8% after 10 washes for V1 and V2, respectively.

Thermal conductivity calculations of binary liquid organic mixtures by molecular dynamics simulation and its interpretation of microscopic heat transfer mechanism

ABSTRACT Heat transfer is an important transmission phenomenon in the nature, and thermal conductivity is a basic thermodynamic data. In the process of chemical production, the reactants and products are mostly mixed liquid systems, but their thermal conductivity data are missing and difficult to define. The mechanism of thermal conductivity of liquid organics is still not sufficiently clarified at present. In this paper, the heat conduction of binary liquid organic mixtures: 3-pentanone + butanol, butanol + decane and heptane + n-undecane was simulated by nonequilibrium molecular dynamics, and the thermal conductivity at different weight fraction was calculated. The deviation between the calculated value and the experimental value of thermal conductivity is less than 9.3%. The results of heat flux decomposition and atomic heat path analysis show that thermal energy is mainly transferred through Coulomb interaction, kinetic energy and torsion angle. In addition, the molecular structure of the mixture and the weight fraction of each component are significantly correlated with the heat transfer mechanism. This study provides a preliminary insight into the heat transfer mechanism of binary liquid organic mixtures.

Heat of Decomposition and Fire Retardant Behavior of Polyimide-Graphene Nanocomposites

Polyimide is a high-performance engineering polymer with outstanding thermomechanical properties. Because of its inherent fire-retardant properties, polyimide nanocomposite is an excellent material for packaging electronic devices, and it is an attractive electrode material for batteries and supercapacitors. The fire-retardant behavior of polyimide can be remarkably improved when polyimide is reinforced with multilayered graphene sheets. Differential scanning calorimetry and thermogravimetric analysis were used to study the heat of decomposition and gravimetric decomposition rate, respectively, of polyimide-graphene nanocomposites. Polyimide/graphene nanocomposites containing 10, 20, 30, 40, and 50 wt.% of multilayered graphene sheets were heated at a rate of 10 and 30 °C/min in air and in nitrogen atmosphere, respectively. The rate of mass loss was found to remarkably decrease by up to 198% for nanocomposites containing 50 wt.% of graphene. The enthalpy change resulting from the decomposition of the imide ring was found to decrease by 1166% in nitrogen atmosphere, indicating the outstanding heat-shielding properties of multilayered graphene sheets due to their high thermal conductivity. Graphene sheets are believed to form a continuous carbonaceous char layer that protects the imide ring against decomposition, hence decreasing initial mass loss. The enthalpy changes due to combustion, obtained from differential scanning calorimetry, were used to calculate the theoretical heat release rates, a major parameter in the determination of flammability of polymers. The heat release rate decreased by 62% for composites containing 10 wt.% of graphene compared to the neat polyimide matrix. Polyimide has a relatively lower heat of combustion as compared with graphene. However, graphene significantly decreases the mass loss rates of polyimide. The combined interaction of graphene and polyimide led to an overall decrease in the heat release rate. It is noted that both mass loss rate and heat of combustion are important factors that contribute to the rate of heat released.

Numerical study of the evaporation and thermal decomposition of a single iron(III) nitrate nonahydrate/ethanol droplet

The heating, evaporation, and possible thermal decomposition of spherically symmetric droplets consisting of a precursor solution of iron(III) nitrate nonahydrate (INN) and ethanol (EtOH) for nanoparticle synthesis in spray flames are studied numerically. The multicomponent droplets are at standard conditions and the evaporation is initiated through the elevated temperature of the convective ambience. The liquid mixture properties of INN and ethanol used in the model are fits to new experimental data. In general, there are two different pathways through which the nanoparticle synthesis may occur from the precursor solution. In one pathway, the particle forms directly inside the liquid precursor solution, and in another pathway, the droplet is transferred entirely into the gas phase from which the nanoparticle may form. The process is initially governed by the evaporation of ethanol and of the water from the INN. For ambient gas temperatures below the thermal decomposition temperature Tth of INN, the evaporation eventually leaves behind an iron(III) nitrate particle and for higher temperatures beyond Tth, thermal decomposition and liquid-phase reactions may occur inside the precursor droplet, transferring the iron(III) nitrate entirely into gaseous Fe2O3 and N2O5, so that the entire liquid droplet transforms into the gas phase. Parameter studies of the evaporation of the INN/ethanol droplet for both situations are presented. Moreover, the process in both dry and humid air is investigated. The water condensation on the droplet surface prolongs the droplet evaporation time and leads to higher droplet surface temperatures for high ambient gas temperatures, promoting thermal decomposition of the iron(III) nitrate.

PHYSICO-CHEMICAL PARAMETERS OF SIBERIAN LARCH (LARIX SIBIRICA) BARK EXTRACTED WITH WATER-AMINO-ALCOHOLIC EXTRACTANTS

This paper presents the results of a thermal analysis, that involved thermogravimetry (TG/DTG) and differential scanning calorimetry (DSC), of natural bark of Siberian larch (Larix sibirica Ldb.) vs. the bark extracted with 5% water-monoethanolamine (MEA) and (vs.) 5% water-triethanolamine (TEA). Thermogravimetric data obtained in an oxidative (air) atmosphere allowed us to identify temperature ranges of thermal decomposition stages for the larch bark samples, as well as to determine the corresponding mass loss and mass loss rate at programmed heating. The Ozawa-Flynn-Wall (OFW) method was used to calculate the dependence of activation energy of the thermal decomposition of experimental samples on the conversion degree (Еа = f(a)); the symbate run of Еа = f(a) curves was established. The DSC data obtained agreed with those of TG/DTG. The integral heat of the bark thermal decomposition (9.60 kJ/g and 14.12 kJ/g for MEA and TEA, respectively) indicated the bark to be competitive with other biofuels, such as briquetted lignin, wood pellets, sunflower husk, rapeseeds, and straw.

Effect of alkali metal occurrence on the pyrolysis behavior of rice straw

Alkali metals are important factors affecting the process of biomass pyrolysis. In this paper, rice straw (RS) with different occurrence forms of alkali metals was used as the research object. The heat decomposition characteristics, the release law of small molecule gases and the change law of in-situ pyrolysis tar composition were investigated by the thermal mass spectrometer (TG-MS) and thermal pyrolysis-GC/MS (Py-GC/MS) to reveal the action mechanism of different occurrence forms of alkali metals in the pyrolysis process. The results showed that with the increase of the removal degree of alkali metals from rice straw, the release temperature of small molecules during the pyrolysis shifted to the high temperature region, due to the catalytic effect of alkali metals on the escape of small molecules. The different occurrence forms of alkali metals had different influences on the tar components. Water-soluble alkali metals inhibited the production of alcohols and promoted the production of ketones and aldehydes. Ion-exchanged alkali metals had different effects on oil composition at different temperatures. At the pyrolysis of 300°C, the presence of ion-exchanged alkali metals inhibited the production of aldehydes and ethers, and promoted the production of esters and ketones, but opposite effect was obtained at the temperature higher than 400°C. Kinetic analysis showed that both water-soluble alkali metal ions and exchanged alkali metals could reduce the activation energy of biomass pyrolysis.

Oxidation characteristics and explosion risk of 2, 5-dimethylfuran at low temperature

The thermal oxidation reaction of 2,5-dimethylfuran (DMF) was investigated using a custom-designed mini closed pressure vessel test (MCPVT) and traced by 1H nuclear magnetic resonance(1H NMR). The oxidation behavior was monitored by-via temperature–time (T-t) and pressure–time (p-t) plots of MCPVT recording. Oxidation products were determined via gas chromatography-mass spectrometry (GC–MS), and the generated peroxide was examined by iodimetry and thin-layer chromatography (TLC), with the thermal decomposition hazard evaluation by differential scanning calorimeter (DSC) and MCPVT. Results show that the DMF oxidation reaction proceeded through initial oxygen absorption at 39.3 °C, followed by an exothermic self-accelerating oxidation at 84.5 °C. DMF could form high level peroxide in auto-oxidation; the decomposition of peroxides would lead to the radical oxidation that the generated ·OH radical mainly attacks on the position 2/5 of DMF with subsequent addition of O2 initiating ring-opening reaction, in which DMF was firstly converted to cis-3-hexene-2,5-dione, and then produced the trans-3-hexene-2,5-dione with strong photoisomerism. DMF oxidation showed a high level of residue formation, and those solid products contained considerable amount of peroxides with a high thermal hazard; its exothermic onset temperature (T0) and decomposition heat (QDSC) of 58.8 °C and 1982.3 J∙g−1, and the decomposition maximum temperature rising rate (dT/dt)max and maximum of pressure rising rate (dp/dt)max was 9.98 °C∙s−1 and 291 kPa∙s−1, respectively. Thermal decomposition of those peroxide products could give rise to thermal runaway of DMF oxidation, and further transformed into a detonation possibly.

Development of a pyrolysis model for oriented strand board. Part I: Kinetics and thermodynamics of the thermal decomposition

Oriented strand board is a widely used construction material responsible for a substantial portion of the fire load of many buildings. To accurately model the response of oriented strand board to fire, thermogravimetric analysis, differential scanning calorimetry, and microscale combustion calorimetry tests were carried out to construct a thermal decomposition model using a numerical solver, ThermaKin, and a hill climbing optimization algorithm. The model included a single-step water vaporization reaction and four consecutive reactions representing thermal decomposition of organic constituents of oriented strand board. The experiments and modeling revealed that the first two of the four reactions are endothermic, while the last two are exothermic. The net heat of decomposition was found to be near zero. The heat capacities of condensed-phase species and heats of combustion of evolved gases were also determined. The heats of combustion were found to vary over the course of decomposition—the trend captured by the model. Development of a complete pyrolysis model for this material will be a subject of Part II of this work.

Ionic liquid-assisted synthesis of porous boron-doped graphitic carbon nitride for photocatalytic hydrogen production

This work presents a simple way to prepare boron-doped graphitic carbon nitride (B/g-C3N4), exhibiting an enhanced photocatalytic performance to split water for hydrogen production. B/g-C3N4 was synthesized via the pyrolysis of urea and 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF4), which was adopted as the boron source. The aggregate of B/g-C3N4 nanosheets shows a porous structure since some bubbles are generated under the heat decomposition of ionic liquids. The porous structure is conducive to the exposure of more active sites. Moreover, B-doping will form some localized electronic energy levels in the band gap of g-C3N4, thereby extending its visible light response. As impacted by the porous structure of B/g-C3N4 aggregate and the narrow the band gap, the photocatalytic hydrogen generation rate (901 μmol h−1 g−1) is increased, almost 3 times faster than g-C3N4 (309 μmol h−1 g−1). This work proposed a simple method to prepare the aggregate of B/g-C3N4 nanosheets exhibiting pores under ionic liquid assistance. It can be a novel method to design porous polymer photocatalysts.

Investigation on the Impact of Biofield Energy Treatment on the Physical, Thermal and Spectroscopic Characteristics of Zinc Chloride

Zinc is an essential trace mineral that plays an important role in the human body as a regulator for different enzymatic systems. It is used in various supplements in the form of zinc chloride to meet the daily requirements. This study was designed with the aim to investigate the impact of The Trivedi Effect®- Energy of Consciousness Healing Treatment on the various physical, thermal, and spectral properties of zinc chloride. The study involves dividing the zinc chloride sample in two parts, followed by keeping the first part untreated and named it the control sample. Besides, The Trivedi Effect®- Biofield Energy Healing Treatment was provided to the other part remotely by the renowned Biofield Energy Healer, Mr. Mahendra Kumar Trivedi and the sample was termed as Biofield Energy Treated sample. Later on, both the samples were analyzed using PXRD, PSA, DSC, UV-Vis, and FT-IR analytical techniques. The PXRD analysis revealed the significant changes in the crystallite sizes (from -66.68% to 25.02%) and the relative peak intensities (from -81.35% to 141.22%) along with 26.46% decrease in the average crystallite size of the Biofield Energy Treated sample, compared with the control sample. Additionally, the treated sample showed reduction in the particle sizes d10, d50, d90, and D(4,3) values by 92.18%, 23.24%, 14.48%, and 29.31%, respectively as compared to the control sample. However, the surface area of the treated sample was observed to be significantly increased by 224.57%, compared to the control sample. The DSC analysis revealed slight increase in the melting and decomposition temperature of the Biofield Energy Treated sample by 0.84% and 3.62%, respectively; along with the significant increase in the latent heat of melting and decomposition by 24.85% and 123.23%, respectively, compared to the control sample. It showed that the thermal stability of the treated sample was significantly increased. However, the UV-Vis and FT-IR studies revealed that the structural properties of the control and treated samples were remained same. The overall study represents that The Trivedi Effect®- Energy of Consciousness Healing Treatment may be used to generate a polymorphic form of zinc chloride, which might possess enhanced solubility, dissolution and bioavailability profile along with improved thermal stability, compared to the control sample. Such properties of the treated zinc chloride may ensure its efficacy, stability and safety during the process of shipment, handling, and storage; thus, The Trivedi Effect®-Energy of Consciousness Healing Treated zinc chloride would be useful for designing the better formulation with enhanced bioavailability, stability and efficacy profile.

Solving Environmental Problems by Recycling the Cut Chalk To Lime in a Rotating Furnace

A technology of processing chalk from the Lebedinskoye deposit into high quality lime by roasting in a rotary kiln is proposed. A procedure has been developed for the thermodynamic calculation of the specific heat of decomposition of carbonates contained in chalk. The material and heat balances of the operating rotary kiln have been compiled. All the main parameters of its operation and the optimal fuel consumption for chalk processing have been determined.

Influence of Particle Size on the Heat and Mass Transfer Characteristics of Methane Hydrate Formation and Decomposition in Porous Media

In nature, permafrost regions and deep ocean sediments contain a large amount of gas hydrate. As a basic property of the sediments, the particle size of the porous media is a critical factor affect...

Regulating safety and energy release of energetic materials by manipulation of molybdenum disulfide phase

Designing advanced component for synergistically achieving the safety performance and energy releasing of widely studied energetic materials (EMs) is of far-reaching significance in composite solid propellants. Herein, molybdenum disulfide with high-active 1T phase (1T-MoS2) was engineered by a phase-manipulation strategy through chemical Li-intercalation from its original state (2H-MoS2). The as-prepared 1T-MoS2 was used for the improved safety and decomposition performances of two typical EMs (ammonium perchlorate: AP and 1,3,5,7-tetranittro-1,3,5,7-tetrazocane: HMX) in propellants. Lubricant 1T-MoS2 endowed considerable advances in safety performance of EMs, with remarkably reduced the impact and friction sensitivity. Besides, fast energy-releasing performance with visibly lower activation energy was realized for AP@1T-MoS2 and HMX@1T-MoS2. In addition, large decomposition heats were simultaneously achieved. Computational studies disclosed this improvement could be attributed to the multi-coupling effect arising from the promoted electron transfer capability, strong affiliations of catalyst/burning products and the abundant actives sites of 1T-MoS2 phase. Our results demonstrate substantial improvements in the synergistical design of safe and fast-decomposed AP and HMX complex for solid propellants.

Shear deformation of nano- and micro-crystalline olivine at seismic slip rates

Several thermally activated mechanisms have been proposed to explain the dynamic weakening of faults at fast, seismic slip rates v > 0.1 m s−1. Nevertheless, direct constraints from microstructural observations on the operation of such weakening mechanisms are still lacking for most rock forming minerals. This includes olivine, a very refractory mineral relevant for seismic activity occurring in peridotite massifs. Here, we report mechanical data and microstructures of olivine aggregates deformed in a rotary shear apparatus at slip rates from 10−2 m s−1 to 1 m s−1. A number of 34 shear deformation experiments were performed under axial stresses of 20 MPa and at room temperature. Samples are composed of either synthetic iron-free nanocrystalline forsterite powder (initial grain size = 0.07 μm) or natural iron-bearing olivine powder from San Carlos or San Bernardino (Fo91, Arizona, USA; initial grain size = 70 ± 2 μm). Shear deformation lasts from a few seconds up to 5 min and ends after 0.03 to 3 m of slip. Independently of the initial grain size or composition, friction coefficients decrease from peak values of 0.8 to values below 0.4, after only 0.1 m of slip. The recovered samples were characterized by scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy. For all samples, before the onset of dynamic weakening, the deformation localizes in a principal shear zone, well-marked in the natural olivine aggregates by a rapid decrease of grain size down to <1.7 μm. Variations in texture, fractured grains and the formation of a fine-grained matrix support cataclastic flow at an early stage of deformation, responsible for the foremost grain size reduction. The samples display well-defined zones with partially sintered microstructure, and shape preferred orientation. The initial texture of the cold-pressed starting material is rapidly reduced to a near random distribution after only 0.03 m of slip. All crystal preferred orientations (CPO) remain weak, with a J-index ≲2. Based on the microstructures, the dominant deformation mechanism may be enhanced effective diffusion (by surface and grain boundary diffusion) causing mechanical weakening and a viscous behavior, which is then temperature-dependent under sub-solidus conditions. We find no microstructural evidence for frictional melting, flash heating or thermal decomposition. Our results advocate that dynamic weakening of faults is independent of initial grain size, and can be achieved after displacements as low as 0.1 m without production of frictionally induced-melt.

The structure-activity relationships from DSC data

The differential scanning calorimetry becomes nowadays an easily available technique able to provide experimental data which can be used to seek for possible correlations with molecular properties. Among these data, the entropy and enthalpy for different phase transition like melting or decomposition of various related compounds proved to be very fruitful. In the present paper, the enthalpy and entropy data for different phase transitions and decomposition of two classes of related energetic compounds (13 based on phenoxazone derivatives and 6 on substituted (E)-3-(azulen-1-yldiazenyl)-1,2,5-oxadiazole) are analyzed and presented. The heats of decomposition seem to present no correlations as functions of molecular mass or melting temperature, while the heats of melting and the temperatures of melting present a fair correlation as a function of the molecular mass or melting temperature. A particularly good correlation is provided by the entropy of melting as a function of the enthalpy of melting, in accord with their significance for a process at equilibrium.