Initiation mechanisms in radical polymerizations : Reaction of cumyloxy radicals with methyl methacrylate and styrene
Citations Over Time
Abstract
Cumyloxy (1-methyl-1-phenylethoxy) radicals have been generated by thermolysis (60º) of dicumyl hyponitrite in methyl methacrylate and styrene. The carbon-centred radicals formed by interaction of cumyloxyl with the respective monomers were trapped as stable adducts of 1,1,3,3-tetramethyl-isoindolin-2-yloxyl. Extensive hydrogen atom abstraction and methyl radical generation as well as double-bond addition were observed in methyl methacrylate. Styrene underwent only double-bond addition by both cumyloxy and methyl radicals. Some possible implications of these results for polymer structure are discussed. A kinetic study of the decomposition of dicumyl hyponitrite in cyclohexane at various temperatures gave k =7.7 × 1014exp(-13600/T) s-1 for the rate constant. Rate constants for the addition of cumyloxyl to methyl methacrylate (k ˜ 2 × 104 dm3 mol-1 s-1) and styrene (k˜2 × 105 dm3 mol-1 s-1) at 60ºhave been estimated.
Related Papers
- → A vibrational study of cyclohexane and some of its isotopic derivatives—II. Raman and infrared spectra and assignments of cyclohexane-1,1,4,4-d4 and cyclohexane-1,1,2,2,4,4,5,5-d8(1973)17 cited
- → Study of Optical Properties of Two Mesogenic Mixtures as a Function of Temperature(2008)5 cited
- → Elucidation of the Effect of Functional Group Substitution of BN-cyclohexane for Renewable Energy Hydrogen Storage: Density Functional Theory Approach(2022)2 cited
- → X-Ray Study of Benzene-Cyclohexane Mixtures(1939)8 cited
- The Recovery Methods of Cyclohexane in Naphthalene-cyclohexane Mixture(2009)