Zum Mechanismus der thermischen Abspaltung von Chlorwasserstoff aus Polyvinylchlorid. 8. mitt.: Copolymere aus Vinylchlorid und 2-Chlorpropen als polymere Modelle für tertiäre Chloratome in PVC

As polymer model compounds for branched poly (vinyl chloride) with tertiary chlorine atoms copolymers of vinylchloride and 2-chloropropene were prepared. The copolymerization was carried out in bulk at 25°C with acetylcyclohexane sulfonylperoxide. The rate of the thermal degradation of the copolymers in ethyl benzoate increases with growing content of 2-chloropropene monomer units in the polymers. In the same manner, the relative frequency distribution of polyene sequences shifts in favour of shorter sequences. The experimental results can be explained by an increased number of starting points for the dehydrochlorination due to the increasing content of tertiary chlorine atomes.