Abstract
Published carbocationic propagation rate constants vary between 2 103 and 5 109 L·mol−1·s−1, e.g. for kp± with styrene in CH2Cl2. The low values were deduced from an evaluation of [Pn±], the high values from competitive experiments assuming diffusion-controlled termination. Recent kinetic and spectrophotometric studies of indene living polymerization have given intermediate values (5 104 to 5 105 L·mol−1·sec−1). An explanation of the high values obtained by the competition method is suggested.
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