AbstractA polymerization activity test has been developed for evaluating the purity of commercial vinyl chloride. A 40‐g. portion of vinyl chloride is heated with 0.500 g. of benzoyl peroxide for 2 hr. at 70°C. in a glass liner in a stainless steel autoclave, and the weight of the polymer formed determined. The effects of the heat transfer medium in the autoclave, time, oxygen, limited agitation, catalyst concentration, and temperature on the percentage conversion of monomer to polymer were determined. The effect of acetaldehyde, crotonaldehyde, chloroprene, 1,1‐dichloroethane,trans‐1,2‐dichloroethylene, paraldehyde, and 1,1,2‐trichloroethane on the conversion and the molecular weight of the polymer are
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