Sur la dégradation thermique du chlorure de polyvinyle. I. Méthodes expérimentales d'etude cinétique

An apparatus for polyvinyl chloride thermal degradation under isothermal conditions and in a controlled atmosphere is described with precision. Continuous measurement of loss of weight of the sample under degradation and, at the same time, continuous titration of hydrochloric acid evolved, can be carried out. The apparatus consists essentially of a magnetically equilibrated Ugine‐Eyraud balance, in which runs a purified gas stream that picks up volatile products in an argentimetric titration cell, coupled to a titrimeter and recorder. Total precision of simultaneous measurements is 1%. An example of the experimental results is given.