Abstract
Oil in water, vinyltoluene - SDS - water - n-pentanol microemulsions are prepared and used to study the kinetics and mechanism of polymerization reactions of vinyltoluene. Initiations are effected by using both potassium peroxodisulphate (KPS), a hydrophilic and 2,2' azobisicobutyronitrile (AIBN), a hydrophobic initiator separately. At the end of polymerization, stable polymer microlatexes are obtained. The viscosity average molecular weights M v ) range from 1.5 to 3.2 × 10 6 . The R p and M v show fractional and negative order dependence on initiator concentration respectively, but vary directly with monomer concentration. The overall activation energy of polymerization (20.4 kcal/mol) agrees with that for homogeneous vinyl polymerization.
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