Journal of Polymer Science Polymer Chemistry Edition · 1974 · 51 citations · 12 references
Natural SciencesChemical EngineeringChemistryOrganic ChemistryPolymer ChemistryPolymer MaterialsPetrochemical ProcessingPolymer AnalysisPolymer CharacterizationPolymer Physical ChemistryPolymer ProcessingVolatile Organic CompoundsAliphatic HydrocarbonsAromatic HydrocarbonsChlorinated HydrocarbonsDecomposition MechanismsPolymer PyrolysisPyrolysisPyrolysis KineticsRepeated Pyrolysis
Abstract Poly(vinyl chloride) (PVC) alone or mixed with 10 wt‐% and 50 wt‐% TiO 2 , SnO 2 , ZnO, and Al 2 O 3 were pyrolyzed by using a pyrolysis gas chromatograph. Benzene, toluene, ethylbenzene, o ‐xylene, styrene, naphthalene, and various chlorobenzenes were identified. No hydrocarbons could be detected in pyrolysis products of any samples at 200°C. More aromatic hydrocarbons than aliphatic hydrocarbons are released from the PVC–TiO 2 system and in preheated PVC. The contrary result is observed in the PVC–ZnO and PVC–SnO 2 systems. Aromatics having methyl endgroups are easily released from the PVC–ZnO and PVC–SnO 2 systems and at elevated pyrolysis temperature, because methylene groups are easily isolated along the chain by ZnO, SnO 2 and the heating. The release of ethylbenzene o ‐xylene, and chlorobenzenes suggests a repeated dehydrochlorination and recombination of HCl and Cl 2 to double bonds along the chain. Possible decomposition mechanisms of PVC are discussed.
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