Differential thermal analysis, reactive

Reactivity (instability) information Acceleration rate calorimetry Differential thermal analysis (DTA) Impact test Thermal stability Lead block test Explosion propagation with detonation Drop weight test Thermal decomposition test Influence test Self-acceleration temperature Card gap test (under confinement) JANAE Critical diameter Pyrophoricity... 

Fig. 7.10. The solid state reactivity of shock-modified zirconia with lead oxide as studied with differential thermal analysis (DTA) shows both a reduction in onset temperature and apparent increase in reaction rate. The shock-modified material has a behavior much like the much higher specific surface powder shown in B (after Hankey et al. [82H01]).

Reactivity (instabiiity) information Acceleration rate calorimetry Differential thermal analysis (DTA) Impact test Thermal stability Lead block test... 

ASSESSMENT OF REACTIVE CHEMICAL HAZARDS COMPUTATION OF REACTIVE CHEMICAL HAZARDS DIFFERENTIAL SCANNING CALORIMETRY DIFFERENTIAL THERMAL ANALYSIS MAXIMUM REACTION HEAT REACTION SAFETY CALORIMETRY... 

ARC = Accelerating Rate Calorimeter (Columbia Scientific Instrument Corp.) DSC = Differential Scanning Calorimeter DTA = Differential Thermal Analysis RC1 = Reactor Calorimeter (Mettler-Toledo Inc.) RSST = Reactive System Screening Tool (Fauske and Associates) VSP = Vent Size Package (Fauske and Associates) ... 

Potential hazards (flammability, corrosivity, etc.) are reviewed to identify concerns regarding the storage and handling of reactive chemicals, and information is obtained from raw material suppliers (e.g., technical bulletins). Flashpoint, DSC, or differential thermal analysis (DTA) testing is typically done by the customer. 

ASSESSMENT OE REACTIVE CHEMICAL HAZARDS CHEMICAL STABILITY/REACTIVITY ASSESSMENT DIFFERENTIAL SCANNING CALORIMETRY (DSC) DIFFERENTIAL THERMAL ANALYSIS (DTA)... 

Kissinger, H. E., Reactive kinetics in differential thermal analysis. Anal. Chem., 29, 1702 (1957). 

The reactivity value is obtained by using the peak temperature of the lowest differential thermal analysis (DTA) or differential scanning calorimeter (DSC) exotherm value as shown in column 2 of Table VI. Alternatively, it can be obtained from a qualitative description of the instability (or... 

Hayes (1960) observed that products from heating glucose with glycine in aqueous media under reflux conditions had some compositional properties and reactivities similar to those of the HAs isolated in aqueous base from a sapric histosol. The techniques used for the comparisons included differential thermal analysis (DTA) (see Figure 1.2). However, that work was done before the introduction of NMR to such studies. 

A-Nitro and acetyl-substituted 1,3,5,7-tetrazocanes are important compounds as explosives and propellants <1996CHEG-II(9)705>. In the syntheses of the nitro-substituted 1,3,5,7-tetrazocanes, their processing, and application, it is possible that they come into contact with ammonium nitrate, or they are directly mixed with this oxidant. Thermal reactivity of the nitro-substituted 1,3,5,7-tetrazocanes has been examined by means of nonisothermal differential thermal analysis <2005MI11>. It has been established that impurities of ammonium nitrate can destabilize some A-substituted 1,3,5,7-tetrazocanes and that this effect is due to acidolytic attack of nitric acid. 

The fundamental research work was subvided into 3 parts [ 6o ] - thermogravimetric analysis (TGA) and differential thermal analysis (PTA) of minute samples (5 50 mg) of the material to be studied. Both techniques yield information on the rate of thermal decomposition, the heat of reaction, the kinetic parameters of this process (pseudo-order and activation energy) and the amount of residue. The analysis of the evolving product has been monitored by means of gas chromatography. High temperature oxidation of the residue allows to compare the reactivity of the carbonized residue. ... 

Differential thermal analysis is widely used for determining exotherm and endotherm of reactive substances. It can also be used for determining transition temperatures, such as the glass transition temperature and the melt temperature of polymers (ASTM D3418). ASTM D472 provides directions for reporting thermoanalytical data. 

Thermoanalytical methods constitute a powerful and versatile collection of techniques for the characterization of ceramic reactions and phase equilibria. Some property of the sample is followed as a function of time or temperature or both while it undergoes a prescribed temperature program. Table 8.3 gives the major thermal methods. The most common methods applied to studies of reactivity in ceramics are TG, differential thermal analysis (DTA), differential scanning calorimetry (DSC), evolved gas analysis (EGA), and dilatometry. The various types of spectroscopy, diffraction, and microscopy can also be conducted on a hot stage in controlled atmospheres. 

Thus the kinetics of thermal oxidative degradation has been studied by thermogravimetry" and the anti-oxidant ability of phenol and phosphorus derivatives have been evaluated by differential thermal analysis. Studies of the effect of red phosphorus and phosphorus and bromine"- on d adation bdiaviour and their role as fire-proofing agents has been described. Bis(ketimines) have been evaluated as reactive additives for viscosity stabilization in the melt."... 

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