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

Abstract

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.

High Solids Vinyl Acetate Polymers from Miniemulsion Polymerization

“…Three reviews did appear recently. [2][3][4] In that process, the size of the droplets is very small, typically in the range 100-500 nm, so that these droplets offer a surface area large enough to capture efficiently the oligoradicals coming from the water phase. Further, the monomer droplets can include an oil-soluble initiator, such as benzoyl peroxide (BPO) or azobis(isobutyronitrile) (AIBN).…”

Analytical Methods

“…• potentiometric titration, 31,32 • argentopotentiometric titration, [33][34][35][36] • pehametric, [37][38][39][40][41] • conductometric measurement. 25,31,[42][43][44][45][46][47][48][49] The last method, conductometric measurement, is by far the most popular.…”

Epoxy Based Thermal Stabilizer for Poly(Vinylchloride)

“…The development of colour was used in earlier days to follow the decomposition of PVC 7 , and this method is the most commonly employed for the practical assessment of the stability and stabilization of polymers. Other methods such as IR absorption spectra permit the analysis of the sequences of unsaturation resulting from dehydrochlorination 4 .…”