Reaction of methyl methacrylate with OH radicals in dilute aqueous solution. A pulse radiolysis study

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Abstract

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, 2kl = 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 × 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 × 107 mol-1 dm3 s-1.

Original languageEnglish
Pages (from-to)275-283
Number of pages9
JournalResearch on Chemical Intermediates
Volume25
Issue number3
DOIs
Publication statusPublished - Jan 1 1999
EventProceedings of the 1998 4th Biennial Trombay Symposium on Radiation and Photochemistry, TSRP-98 - Mumbai, India
Duration: Jan 14 1998Jan 19 1998

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ASJC Scopus subject areas

  • Chemistry(all)

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