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Reaction of Methyl Methacrylate With Oh Radicals in Dilute Aqueous Solution. a Pulse Radiolysis Study

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The initial steps of OH* radical induced oligomerization of methyl methacrylate (MMA) were studied in dilute aqueous solution by the methods of pulse and steady-state radiolysis. The MMA radicals were detected by their light absorptions with λmax = 290 nm and εmax = 700 mol-1 dm3 cm-1. The radicals decay in competition of radical--radical self-termination, 2k1 = 1.0 × 109 mol-1 dm3 s-1, and radical--molecule oligomerization, k3 = 3 × 103 mol-1 dm3 s-1, reactions. According to simulation calculations the propagation of longer radicals also takes place with a rate constant close to 3 x 103 mol-1 dm3 s-1. However, the dimer, trimer, etc. radicals terminate more slowly than the monomeric radicals with a rate constant of ca. 3 x 107 mol-1 dm3 s-1.

Affiliations: 1: Institute of Isotopes of the Hungarian Academy of Sciences, H-1525 Budapest, P.O.Box 77, Hungary


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