Cationic Polymerization of Cyclic Dienes. VII. The Kinetic Observations on the Polymerization of 1,3-Cyclohexadiene

1, 3-Cyclohexadiene was polymerized at 0°C in methylene chloride or benzene using boron trifluoride etherate or stannic chloride-trichloroacetic acid as catalyst. The former catalyst led to a stationary-state polymerization but the latter brought about a non-stationary-state polymerization in which the initiation reaction was very fast. The very fast initiation reaction is a consequence of a strong interaction between the monomer and the metal halide. Part of the added catalysts was made inactive by the interaction with the excess monomers.