Decomposition kinetics of free radical initiators in micellar solutions

Abstract

The kinetic parameters of thermal decomposition of initiators, azo-bis-isobutyronitrile (AIBN) and dicyclohexyl peroxydicarbonate (PC), have been measured in aqueous micellar solutions of sodium dodecylsulfate (SDS), cetyltrimethylammonium bromide (CTAB), and egg lecithin. The inhibitor technique and acceptors of free radicals have been used to estimate the efficiency of the initiation during AIBN decomposition. The rate constant of PC decomposition in a SDS micellar solution is the same as inn-decane. CTAB and lecithin accelerate the rate of PC decomposition. Mechanisms of surfactant effect on the PC decomposition are discussed.