As for PS, depolymerization was the main reaction and styrene
monomer was detected in pyrolysis process. Aromatic compounds
were found in pyrolysis products of PVC. The dechloridation of PVC
occurs simultaneously with rearrangement and cyclization of conjugated
polyene, which leads to produce dioxin in pyrolysis of PVC.
The free radical of the decomposition could combine into a stable
compound. When PE mixed with PVC or PS, some newly unsaturated
hydrocarbon groups existed in the obtained products and
the producing of alkynes is restrained.