The initial free radicals of cyclic amine species formed through the reaction of peroxgdisul-fate with cyclic amines such as morpholine (MP)

piperidine (PD) and their N-substituted derivatives were studied by spin trapping technique and ESR spectra. It was confirmed by ESR spectra and the amino end group analysis that the morpholino and piperidino free radicals were responsible for initiation of winyl polymerization in addition to sulfate radical (HO3SO) when peroxydisulfate/alicyclic secondary amine system was used as initiator

and the cyclic aminoalkyl radcal was one of the initial free radicals in the system when peroxydisulfate was reacted with tertiary cyclic amines such as N-methyl morpholine (NMMP)

N-ethyl morpholine (NEMP).