Abstract
Mechanical degradation and mechanochemical block copolymerization in poly(vinyl chloride)–styrene–solvent mixtures were studied using ultrasonic irradiation at 60°C. The effects of the concentrations of poly(vinyl chloride), styrene, and solvents on mechanical degradation were investigated. The rate equation for mechanical scission agreed with an expression given earlier. The rate constant for mechanical degradation was obtained from the change in the number of scissions of poly(vinyl chloride). In addition, the effects of the concentrations of poly(vinyl chloride) and styrene on mechanochemical block copolymerization were investigated. The rate equation for mechanochemical copolymerization was deduced, and the experimental results were in fair agreement with this equation. Changes in the amounts of the block copolymer, poly(vinyl chloride), and polystyrene in the reaction products were followed by turbidimetric titration. The apparent block ratio, the ratio of the poly(vinyl chloride) units in the block copolymer to the total poly(vinyl chloride) content, was ca. 80.1 %.
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