Abstract
The kinetics of acrylamide (AM) polymerization initiated by V(V)-cyclohexanone(CH) redox system in the presence of anionic surfactant, sodium dodecyl sulphate (SDS), in aqueous sulphuric acid have been studied over a temperature range of 30-50°C. The rate of Polymerization, RP(obs), as well as the rate of V(V) consumption, -RV, were found to increase in the presence of SDS, above its CMC, while decrease with cationic surfactant, cetyl trimethylammonium bromide (CTAB). The non-ionic surfactant, TX-100, has no effects on the rates. Both the rates were also determined at varying concentration of AM, V(V), CH, H+ and at various ionic strength in the presence of 0.015M SDS in the solution. The overall activation energy for the proccesses calculated from the Arrhenious plot, were found to be 19.34 and 26.58 kcal/mol in the presence and absence of 0.015M SDS. The viscosity average molecular weight of the polymer obtained in presence of SDS increases with the concentration of SDS. A suitable free radical mechanistic scheme for the polymerization process is proposed.
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