It is well known that some initiators can be decomposed to two radicals with different reactivities. Based on this fact

an equation of polymerizationis proposed. Semi-log plots of Rp2[I]][M] vs Rp/[M]2 clearly show the effect of un-equally reactive primary radical termination on polymerization in a wide range of concentration of initiator. For example when the concentrations of the initiator like benzoin and O-acyl-a-oximinoketones are greater than 1.0×10-2 (M)

polymerization is clearly effected by un-equally reactive primary radicals termination

and this effect will decrease as the temperature of polymerization is increased

which means Eprt-Ei-Ep