Abstract
Poly vinyl chloride (PVC) is easily degraded and colored by heating through dehydrochlorination and formation of a polyene structure. The measurement of evolved hydrogen chloride is the most suitable method for evaluation of the early stage of degradation. An apparatus is described for the accurate, safe and reproducible measurement of hydrogen chloride evolved during the degradation of PVC. The reaction vessel is set in a GC oven. PVC is loaded into the reaction vessel using a special tool. The evolved hydrogen chloride is absorbed in distilled water. The water is pumped from the absorber to the electrical conductivity detector and returns to the absorber. Measurements of the dehydrochlorination rate showed a standard deviation of 2.3% of the mean value.
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