Abstract
Expreiments have been carried out on the benzoyl‐peroxide catalyzed polymerization of methyl isopropenyl ketone at 25 and 40°C. in cyclohexane, a solvent which dissolves the monomer but causes the polymer to be precipitated. It is shown that in solutions of suitable concentration (40–80%) the effect of the cyclohexane is to increase both the rate of polymerization and the intrinsic viscosity of the resulting polymer. The significance of these observations and of other recent experimental work is discussed.

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