Abstract
High yields of monomeric styrene and α-methylstyrene were obtained when polystyrene or poly(α-methylstyrene) was heated at temperatures above 350°C. Other pyrolytic products obtained from polystyrene were benzene, toluene, ethylbenzene and traces of cumene and α-methylstyrene. Similar pyrolytic products were obtained from poly(α-methylstyrene) but toluene and ethylbenzene were present only as traces. Analysis by gas chromatography showed the thermal decomposition products to be similar when three different pyrolytic techniques were used, viz., a hot platinum wire, heated open tubes and closed tubes. No change in the composition of the products was noted when mixtures of these polymers are derivatives of 2-mercaptobenzothiazole were decomposed on the hot platinum wire or in heated open tubes. However, the ratio of monomer to the corresponding unsaturated alkylbenzene in the products obtained from the closed tubes decreased linearly as the concentration of 2-mercaptobenzothiazole derivative was increased.
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