Methacrylic monomers, propagation termination activation energies

The photoinduced polymerisation of methacrylic acid by sodium peroxide has been determined to have an activation energy of 17.7 kJ/molel03. From this the macroradical lifetimes were determined to be 3.9 secs. In the intermittent photoinitiation of methyl methacrylate-styrene the dependence of the rate of propagation on monomer feed composition was understood in terms of a penultimate model and not a terminal model as previously assumed 4 with some evidence for cross-termination. An eosin-periodate combination has been found to induce the photopolymerisation of acrylonitrile where the dye was found to act as both the sensitiser and reducing agent. Hydroxyl radicals are assumed to initiate polymerisation while the N-bromosuccinimide induced photopolymerisation of N,N -methylenebisacrylamide is faster in 2-propanol solution O . 

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