this is to migitate the chance of chain termination as if nucleophilicity of counter ion was larger than that of monomer the carbocation will be readily attacked by counter ion so chain propagation stop
you must have that to have good polymerization process through the propagation of the active chain that having charge of reaction process during the polymerization process
where in propagation process the addition of monomer to the active species, i.e. the carbenium ion. The monomer is added to the growing chain in a head-to-tail fashion; in the process, the cationic end group is regenerated to allow for the next round of monomer addition
i need to say that there are anther factor control that behavior of nucleophilicity of monmers that the Living cationic polymerization
whre it is a living polymerization technique involving cationic propagating species. It enables the synthesis of very well defined polymers (low molar mass distribution) and of polymers with unusual architecture such as star polymers and block copolymers and living cationic polymerization is therefore as such of commercial and academic interest.
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