Thermogravimetric decomposition kinetics

Estimating the isothermal lifetime of pharmaceutical coatings using thermogravimetric decomposition kinetics... 

Thermogravimetric analysis (TGA) can be useful to determine the composition of the adhesive systems and their thermal stability (Zhang et al. 2009). TGA can also yield information about moisture and volatile content, decomposition kinetics, and effect of reactive... 

TA instruments has developed automated thermogravimetric analysis and related kinetic programs that enable a rapid determination of decomposition rates to be made. The following excerpt from a TA application brief [57] explains the method ... 

H2) Freeman, S., and B. Carroll The application of Thermoanalytical techniques to reaction kinetics. The Thermogravimetric Evaluation of the Kinetics of the Decomposition of Calcium Oxalate Monohydrate. J. Phys. Chem. 62, 394/ 397 (1958). 

The thermal behavior of TKX-50 (bis(hydroxylammonium) 5,5 -(tetrazolate-liV-oxide)) and the kinetics of its thermal decomposition were studied using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The thermal decomposition of TKX-50 starts to occur within the range 210-250 °C depending on the heating rate used. 

Thermogravimetric Analysis (TG). TG involves weighing a sample while it is exposed to heat. The chief use of this technique has been to study the thermal decomposition of polymeric materials and to accumulate kinetic information about such decomposition. A sample is suspended on a sensitive balance that measures the weight (Figure 1) as it is exposed to a furnace. Air, nitrogen, or another gas flows around the sample to remove the pyrolysis or combustion prod-... 

A thermogravimetric kinetic study [77] of the decomposition of a-UOj identified two consecutive processes during oxygen loss ... 

From a kinetic thermogravimetric study [48], supported by microscopic observations, it was concluded that the decomposition of pyrites occurs in two stages starting above about 800 K. The first mass loss occurred during the formation of... 

The kinetics and mechanism of thermal decomposition have often been studied by methods such as thermogravimetric analysis (TGA), differential thermal analysis (DTA), pyrolysis gas chromatography, or - by means of small externally heated retorts, agitated vessel or fluidized bed reactors. The usefullness of the results of these studies is often limited because ... 

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. ... 

---