Abstract
A procedure is described for preparation of uniform-composition copolymers of vinyl chloride–propylene, polymers whose composition does not vary as a function of polymer conversion. Inherent viscosity (IV) and melt flow (MF) properties of these resins were determined. These were related to the propylene content (%PB) of the polymer. A linear relationship was found for IV versus %PB and log MF versus %PB. Variation in copolymer composition as a function of conversion for batch-copolymerized vinyl chloride–propylene (VCM–P) system were calculated using established reactivity ratios. These values of %PB at different conversions were used to predict the MF and IV values for batch-copolymerized VCM–P systems at different conversions. Experimental verification of these predictive values were made. Close agreement was found for predicted and experimentally determined MF values at different conversions. Unusual effects were observed between the predictive and experimentally determined IV values at different conversions.
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