were found at the temperatures of 353 C and 462 C. Sawdust
played a leading role at the temperature of 353 C in the pyrolysis
process. In this stage, as the sawdust content increased, the absorption
of hydrocarbons decreased significantly and the vibration of
the functional groups, such as ketones, aldehydes and ester, was
increased noticeably. As a result, a large number of oxygen functional
groups were produced.
Rubber played a primary role at the temperature of 462 C in
the pyrolysis process. In this stage, as the sawdust content
increases, the absorption peak of hydrocarbons was sharply
reduced. Due to the higher oxygen content in sawdust compared
to rubber (Table 1), the adding of sawdust generated a large
amount of oxygen free radicals at high temperatures. The oxygen
free radicals accelerated the decomposition of macromolecular
substances in rubber, leading to an easier conversion from the
hydrocarbons to oxygen compounds. In addition, the vibration
peaks of sulfur compounds were detected. The releasing patterns