Effect of benzophenone on the H2O2-induced photopolymerization of methyl methacrylate

✍ Scribed by P. Ghosh; G. Mukhopadhyay; R. Ghosh

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 323 KB
• Volume: 16
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(80)90153-6

✦ Synopsis

Abstraet--lknzophenone (BP) in low concentrations (<0.001 mol i-~) produces a rate enhancing effect in the H202-induced bulk photopolymerization of MMA. R4, is proportional to [HaO,] °'4 and [BP] °'*, and k~/k, at 30 ° is 1.00 x 10 .2 I.moi-t sec -'. In diluted systems, different solvents produce different kinetic effects, reaction order with respect to monomer being negative for IPA and THF as solvent, positive but < 1.0 for benzene and chloroform, 1.2 for acetonitrile, CC14 and t-butanol and 1.8 for DMA. The variable solvent effect is attributed to modification of the initiation process by the various solvents to different extents. Kinetic analysis of data for bulk photopolymerization gives evidence for primary radical termination and degradative initiator transfer.