ESR and NMR spectroscopy

Analysis of Hydroperoxides in Solid Polyethylene by MAS 13C NMR and EPR

“…Spectrum a, taken before UV exposure, is a mixture of peroxy and power-saturated polyenyl radicals. Upon exposure to UV light, spectrum b, the hydroperoxides have been cleaved to alkoxy and hydroxy radicals, quickly resulting in the formation of peroxy radicals via H abstraction and participation of oxygen . Further evidence that the radicals we observe are peroxy and not alkoxy is garnered from the fact that alkoxy g 1 values (2.03−2.11) are generally well above the g 1 values observed here (see below) .…”