Effect of organized anionic surfactant system on the kinetics of V(V)-organic substrate-initiated polymerization of acrylonitrile

✍ Scribed by Manabendra Patra; Bijoy K. Sinha

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 232 KB
• Volume: 64
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19970531)64:9<1825::aid-app19>3.0.co;2-w

✦ Synopsis

The kinetics of polymerization of acrylonitrile (AN) initiated by a V(V)cyclohexanone redox system in the presence of a surfactant was studied over a temperature range of 30-50ЊC in acidic medium. The anionic surfactant sodium dodecyl sulfate (SDS) enhances the rate of polymerization (R p ) as well as rate of V(V) consumption (0R v ). The cationic surfactant, cetyltrimethylammonium bromide (CTAB), decreases both R p and 0R v , while the nonionic surfactant, Triton-X-100, has no effect on the rate. The change of concentration of the surfactant, monomer, acid, and cosolvent on the rate of polymerization were examined. Both R p and 0R v are computed in the presence of different organic substrates, i.e., cyclohexanone, cyclopentanone, glycerol, and citric acid. The viscosity-average molecular weight (M V v ) of the polycrylonitrile, obtained at different [SDS], was determined using the Mark-Howink relationship. A suitable mechanistic scheme was proposed for the process.