Graduate School of Engineering, Hokkaido University; N13W8 Kita-ku, Sapporo-shi 060-8628 Japan
The performance of thermal dehydrochlorination of PVC has been studied by FT-IR spectroscopy and the analysis of products by GC. The yields of hydrogen chloride reached to almost constant values under the heating conditions higher than 350 °C. But the yields of chlorinated organic compounds increased with the decomposition of produced polyene at the temperature higher than 400 °C, although their amounts were very small. Therefore it seems that a very small amount of chlorine remains in the residue after the termination of dehydrochlorination. From the FT-IR spectroscopy of residues, the dehydrochlorination rate of isotactic PVC with gauche conformation is lower than that of syndiotactic configuration. The spectrum due to isotactic PVC was slightly observed even in the residue dehydrochlorinated at 400 °C for 120 min.
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