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Effect of Different Parameters in Emulsion Copolymerization of Vinyl Chloride/Vinyl Acetate

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Emulsion copolymerization of vinyl chloride with vinyl acetate comonomer was performed. Different conditions of initiators, emulsifier, and comonomer concentration were chosen in order to investigate the copolymerization reaction. Potassium per-sulphate, a mixture of stearyl alcohol and sodium lauryl sulphate (SLS) were used and reactions were performed at 55°C in a pressurized reactor. Two region of pressure change were distinguished in the pressure-time curves in which by increasing the initiator concentration the flat region was shortened and the descending region showed a higher slope indicating higher reaction rate. Higher initial pressure was found in higher emulsifier concentration while higher pressure drop was achieved in the second region of pressure-time curves. Effect of comonomer content on heat release during copolymerization was studied. Conversion and intrinsic viscosity of the copolymers and their correlation with reaction parameters were also investigated.

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