Abstract
The thermal degradation of various samples of poly(vinyl chloride) (PVC) in trichlorobenzene (TCB) solution at 187°C has been studied in the presence of a 1 1 mixture of zinc and calcium stearates. Two series of PVC samples have been studied, both prepared at 55°C using dicetylperoxydicarbonate as initiator. The first series was prepared in TCB solution and the second in suspension. In each series the conversion of the monomer was varied. HCl evolution and stabilizer consumption were measured. The dehydrochlorination (DHC) rate was studied as a function of the amounts of allyllic chlorine, tertiary chlorine and oxygenated structures initially present in the samples. All these structures are active, especially the oxygenated ones, although quantitative correlations were not clearly obtained.
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