Direct evidence of the second‐order dependence of propagation rate on propene concentration in living polymerization with the [t‐BuNSiMe2Flu]TiMe2/B(C6F5)3 catalyst

Propene polymerization was conducted with the t‐BuNSiMe₂Flu]TiMe₂/B(C₆F₅)₃ catalyst at –50°C at various concentrations of propene. The polymerization proceeds in a living manner regardless of the propene concentration employed. Molecular weight of polymer obtained in a certain polymerization time with low monomer conversion increases with increasing concentration of propene. The logarithmic plot of molecular weight against propene concentration gives a straight line with a slope of 1.8, which indicates that the propagation rate is almost of second order with respect to propene concentration.