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Thermal Initiation of Methyl methacrylate Polymerization by Oxotris (dibenzyl dithiocarbamato | ||
| Al-Mustansiriyah Journal of Science | ||
| Article 1, Volume 22, Issue 4, 2011, Pages 188-201 | ||
| Author | ||
| Salah M. Abdullah | ||
| Abstract | ||
| Oxo tris (dibenzyl dithiocarbamato) vanadium (V), VO(S2CN(PhCH2)2)3 initiates by free radical polymerization of methyl methacrylate (MMA) at 80 C°. Under employed experimental conditions , no retardation or inhibition occurs . The order with respect to the chelate (initiator) is closed to 0.5 , whereas the order with respect to monomer is 1.95 is indicating that the rate of initiation is dependent on monomer concentration . Spectroscopic analyses show that the initiation process occurs predominantly through scission of dibenzyl dithiocarbamate ligand ((PhCH2)2NC(S)S-) with reduction of vanadium (V) to (IV) . A reaction mechanism is proposed based on an intramolecular redox reaction which leads to the primary formation of SC(S)N(PhCH2)2 radical and vanadium (IV) chelate complex . Activation energies of polymerization and initiation processes in the present system were also evaluated. The relevant kinetic parameter are evaluated .The tacticity of MMA polymer produced is examined by IR spectroscopy and the polymer show a photo-activity when irradiated with Ultra-violet light. | ||
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