Abstract
Material of molecular weight less than approximately 400–500 was isolated from food grade poly(vinyl chloride) resins by initial soxhlet diethyl ether extraction and subsequent size-exclusion fractionation. Analysis by packed-column gas chromatography using Hall electrolytic conductivity detection showed the presence of a series of chlorinated components which by subsequent gas chromatography-mass spectrometry were tentatively identified as vinyl chloride oligomers. The chlorinated constituents in the extracts were selectively isolated from other low-molecular-weight components by silica gel chromatography. From low-resolution capillary gas chromatography-mass spectrometry data (together with evidence from hydrogenated extracts) the structures of these oligomers were postulated as being a complete series ranging from trimer to hexamer (and probably to the octamer), each oligomer being represented by species containing a ring or a double bond and each occurring as a number of structural isomers. Other non-chlorinated compounds identified in the resins included mixed phthalates, alkanes, nonylphenol, and undecyl dodecanoate, the latter being derived from the polymerisation initiator lauryl peroxide.
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