With pulse radiolysis and detection by optical absorption spectroscopy in transparent, molten and highly viscous polyethylene (PE) polymer radicals and alkene type radical cations were observed and characterized by their reactions with additives (CCl4, R3N, C2H4, -CH2-O-CH2-etc.). The transformation of PE alkyl radicals to allylic ones takes place under these conditions with a rate parameter of about 3 x 104 s-1. In the presence of additives, such as diphenylamine, benzophenone, styrene, etc., product radicals derived from these substances appear mainly in a very rapid reaction. This effect is discussed in terms of the exciton migration model for alkane type polymers (Partridge, 1970a), which has been supported until now by steady-state irradiation experiments only.
|Number of pages||11|
|Journal||International Journal of Radiation Applications and Instrumentation. Part|
|Publication status||Published - 1989|