Initiation is followed by the propagation step with the addition of more monomers to the carbenium
ion in a rapid exothermic reaction.
The propagation step involves H: shift and :CH3 group shift to form tertiary carbenium ion which is more stable and abundantly available during propagation.
The extent of rearrangement during cationic propagation will depend on the relative stabilities of propagating and rearranged carbenium ions and relative rates of propagation and rearrangement.
The cation radical interacts with the free-radicals from PE molecule fragment through electron transfer that to be deoxidized, inducing the formation of carbenium
ions and increasing the reaction course of cationic polymerization.
Ron Childs, FCIC, has an international reputation for his studies of homoaromaticity and thermal and photochemical pericyclic reactions of carbenium
Akzo has established, from quantum chemical calculations, a rule for judging the charge distribution on carbenium
ions - products of the metabolism of nitrosamines (figure 5).
One very early application of the superacid 100% [H.sub.2.SO.4] was the preparation of stable solutions of aryl carbenium
ions such as the triphenyl carbenium
ion [(C.sub.6.H.sub.5).sub.3.C.sup.+] from the corresponding alcohol.