Ozonisation du Polychlorure de Vinyle en Solution

摘要: Quelle que soit la nature du polychlorure de vinyle (masse ou suspension) l'action l'ozone en milieu homogene dans le tetrachloroethane provoque decroissance continue masse moleculaire domaine temperature 0–120°C et vitesse coupure des chaines deduite variations viscosite est constante conditions isothermes. Quels soient temps d'ozonisation, a chaque point apparaissent fonctions acides α β chlorees qui ont ete caracterisees par spectroscopie infra-rouge, RMN haute resolution dosage potentiometrique dimethylformamide. Outre ces fonctions, peroxydes ege egalement identifies polymere on suivi leur concentration fonction d'ozonisation. Cette etude permet proposer deux mecanismes pour expliquer chaines, l'un suppose une dehydrochloruration prealable l'autre formation instables se decomposant provoqueraient chaines. When the ozonisation of bulk or suspension poly(vinylchloride) is carried out in solution between molecular weight decreases continuously and rate breaking chains deduced from intrinsic viscosity variation constant under isothermal conditions. Whatever time may be, at every breaking, chlorinated acid groups are introduced which have been characterized by infrared spectroscopy, high NMR spectroscopy potentiometric titration Besides these functions, peroxide also identified their has determined for different times temperatures ozonisation. This study permits to propose two mechanisms explain chains. The first implies previous dehydrochlorination polymer second unstable peroxides decomposition cause