Moisture thermal gravimetric analysis

On the other hand, the P—E bond is rather labile toward hydrolysis by even trace amounts of moisture in nonaqueous solvents, producing a series of corrosive products (Scheme 5). Thermal gravimetric analysis (TGA) reveals that, in a dry state, LiPFe loses 50% of its weight at >200 °C but that, in nonaqueous solutions, the deterioration occurs at substantially lower temperatures, for example, as low as 70 X. 

The diorgano tellurium dicarboxylates are white, crystalline materials that are soluble in organic solvents and stable towards atmospheric agents. Diaryl tellurium diacetates can be boiled in water without decomposition. However, bis[trifluoromethyl] tellurium bis trifluoroacetate] was reported to be moisture-sensitive. Aqueous sodium hydroxide converts diaryl tellurium dicarboxylates to diaryl tellurium oxides or dihydroxides . Thermal gravimetric analysis of diaryl tellurium dicarboxylates indicated that these compounds lose carbon dioxide at 240-260° and form the tetraaryl tellurium derivatives. The tetraorgano tellurium compounds decompose slowly to the diaryl tellurium compounds and hydrocarbons. ... 

Several conventions will be followed in this article. Moisture contents are expressed on a dry weight basis. When necessary, the subscript 1 is used for water, and the subscript 2 for the other component in the adsorbent in the absence of a subscript, the property is to be attributed to water. Results of many routine tests conducted in my laboratory have been included here. Although the specific equipment used and all the experimental details are not provided, an effort has been made to include information that can substantially influence the results of the test (e.g., heating rate in thermal gravimetric analysis). These data should be taken as being representative of the substance tested and not necessarily as the results to be expected for a given lot of the substance examined with different instrumentation under different experimental conditions. 

Thermal gravimetric analysis (TGA) is undoubtedly the most widely used method of moisture content determination. The sensitivity and sophistication of TGA instruments ranges from the classical moisture balance (LOD) to specially designed microbalances enclosed in chambers that may be evacuated. Microprocessor control of the temperature increase has led to more reproducible and discriminating information. 

Thermogravimetry or thermal gravimetric analysis TG or TGA Mass change Decomposition temperature Oxidation temperature Volatilisation of moisture and plasticiser Moisture content... 

The thermal stability of SPEK was usually studied by heating samples in a thermo-gravimetric analysis (TGA). TGA was used to determine weight loss. According to the procedure proposed by most of researchers, the samples were preheated under Nj from room temperature to 100°C at 10°C min" to remove moisture, then cooled to 90°C, and then reheated from that temperature to 800°C at lO C min". ... 

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