Is the rate constant of chain propagation kp in radical polymerization really chain-length independent ?

摘要: A careful investigation of the k p data obtained from pulsed-laser polymerization at different pulse separations to in a lot systems has revealed that exhibits slight but significant decrease when t 0 is increased, corresponding an about 20% extending over several hundreds degree polymerization. Transformation this integral effect individual chain-lengths reduces range, course, still shows more than one hundred propagation steps be concerned. This interpreted terms monomer concentration site caused by segments already added growing chain.