Temperature heating rate regarding

At the other end of the temperature spectrum, with high thermal stability of siloxane-modified poly(arylene carbonates) also a desired property, the onset of thermal decomposition (40) for polymers 1-12 was found to be in the range of 385-456°C (as determined from TGA curves obtained by heating polymer samples in nitrogen at a heating rate of 20°C/min.). There does not appear to be any pronounced trend in regard to variation of the thermal stability with structure in polymers 1-12. The small differences in the values of T for these polymers can be due... 

The main objective of this paper is to test simple kinetic models for the pyrolysis of wheat straw. In order to obtain well-defined conditions, especially regarding the sanqile temperature, low heating rate experiments in a thermogravimetric analyzer was preferred. 

The ratio method. When a sample is subjected to a linear temperature increase, the rate of heat flow into the sample is proportional to its instantaneous heat capacity. Regarding this rate of heat flow as a function of temperature, and comparing it with that for a standard sample under the same conditions, we can obtain the heat capacity as a function of temperature. The procedure has been described in detail by O Neil (1966). The principle of this method is shown schematically in Figure 4.5. 

Most kinetic data regarding the thermal conversion of coal are known for relatively low temperatures (< 1200 K) and heating rates (< 10" K/s), which will be discussed in this section. Kinetic pecuharities related to higher temperatures and higher coal heating rates are less available and will be considered in Section 10.4.7. Heating of coal in an inert atmosphere to temperatures of 620-670 K leads to its decomposition with the formation of primary volatile destraction products and coke. Formation and release of the volatile... 

---