Polymerization of methylmethacrylate with cetyl benzyl dimethyl ammonium chloride and benzoyl peroxide as redox initiator system

✍ Scribed by P. Ghosh; S.N. Maity

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 272 KB
• Volume: 16
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(80)90233-5

✦ Synopsis

Polymerization of methylmethacrylate was studied using benzoyl peroxide and cetyl benzyl dimethyl ammonium chloride (CBDAC) combination as the redox initiator at 40 °. Equilibrium complexation between the redox components precedes the radical generation process, and the complex acts as the actual initiating species. Initiator exponent was 0.5 under various conditions of homogeneous polymerization. Kinetics of polymerization in diluted systems were variable in respect of order with respect to monomer depending on the nature of the solvent or additive. DMF, acetonitrile and pyridine produced rate enhancing effects through actively influencing the initiation step; cyclohexanone, acetone, chloroform, methanol and benzene behaved as (normal) inert diluents, while formamide and acetamide produced retardation. Termination of polymerization occurred exclusively bimolecularly. As a redox component, the quaternary chloride salt, CBDAC behaved somewhat differently from quaternary bromide salts cetyl trimethyl ammonium bromide and cetyl pyridinium bromide.