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The cha nges in chemical structure occu ring in pol y (vinyl chloride) as a res ul t of heati ng ina vacu um in t he range 100° to 400° C were studied using infrared spectropho to metry. The pri ncipa l changes occ urri ng in t he residue during p yrolysis in a vacuum were the format ion of unsaturated s tructures a nd a change from an al iphatic spectrum to one showing aromatic absorption. The data are used to suppor t a previously proposed mechani sm of decomposition for poly (vinyl chloride) .

Infrared spectra of thermally degraded poly(vinyl-chloride)