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.
|Number of pages||9|
|Journal||Research on Chemical Intermediates|
|Publication status||Published - Jan 1 1999|
|Event||Proceedings of the 1998 4th Biennial Trombay Symposium on Radiation and Photochemistry, TSRP-98 - Mumbai, India|
Duration: Jan 14 1998 → Jan 19 1998
ASJC Scopus subject areas