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heat absorbed by the sample during pyrolysis) and exothermic behavior in oxidative conditions (see TGA curves in Fig. 15.28 showing positive values of heat flow indicating heat evolved from the sample with combustion). This figure also shows the point of ignition (near 300oC) of the material. In addition DSC results in oxidative condition suggest that the decomposition is in multistages. The TGA results on polypropylene show that it has really few impurities in it (see TGA curves in Figs. 15.29 and 15.31).

Temperature (°C)

Figure 15.29. Thermal decomposition of polypropylene in nitrogen.

Temperature (°C)

Figure 15.29. Thermal decomposition of polypropylene in nitrogen.

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