سنتز كوپليمر وينيل كلريد- وينيل استات به روش پليمرشدن امولسيوني ناپيوسته

Synthesis of Vinyl Chloride-vinyl Acetate Copolymer Through Batch Emulsion Polymerization

PVC in the form of emulsion resin is used in plastisol technology. Among its disadvantages: resin degradation during melt processing, high melt and gel temperature, resinʹs high viscosity in gel and melt temperature and low solubility can be mentioned. Copolymerization of vinyl chloride wih other monomers is a suitable route to modify such properties. Vinyl acetate comonomer improves many of the PVC problems. In this study copolymerization of vinyl chloride with 15.2 percent vinyl acetate was performed in a batch emulsion copolymerization system. Vinyl chloride content in both gas and liquid phase in the reactor, pressure variation and the effect of initiation on the reaction kinetics were investigated. Chemical structure and copolymer composition were characterized by FT1R and NMR spectroscopy. K-Value of the copolymers which is related to molecular weight was determined by solution viscometry.