Pyrolysis-gas chromatography of hydro-genated polyvinylchloride

Abstract

The hydrogenation mechanisms and the structures of hydrogenated polyvinylchloride (HPVC) were studied by pyrolysis-gas chromatography.
Hydrogenated polyvinylchloride were formed with lithium aluminum hydride in boiling tetrahydrofuransolution. Raw polyvinylchloride (PVC) yielded aromatic hydrocarbons such as benzene, toluene and styrene at the pyrolysis temperature of 590°C. These characteristic products were formed by dehydrochlorination reaction followed by cyclization from the triadof vinylchloride units on decomposition.
The yields of aromatic products from HPVC weredecreased monotoilously with the rise of degree of hydrogenation (DH). It was suggested that the triad of vinylchloride unit in HPVC were decreased with the rise of DH. By comparison with the yield ofaromatic hydrocarbon from HPVC and random andb lock copolymers, it was considered that random hydrogenation of HPVC partially contains the block structures.