Abstract
AbstractWhen ethylene–acrolein copolymer was irradiated at −196°C with ultraviolet light, a sharp singlet spectrum with a g value of about 2.001 was predominant. This spectrum is attributed to acyl radicals, which are produced by dissociation of a hydrogen atom from an aldehyde group. At the same time it is supposed that dissociation of formyl groups also took place to give alkyl radicals, CO, and H2. The alkyl radicals reacted with CO molecules to give acyl radicals at −78°C under vacuum. Peroxy radicals were produced when the sample irradiated at −196°C in the presence of air was treated at −78°C. The sample irradiated at −196°C was warmed to near 0°C and an apparent singlet spectrum with a g value of about 2.004 was observed. This spectrum was tentatively assigned as due to free radicals of the type
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