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, the group CH2OCH2, etc.). The transformation of PE alkyl radicals to allylic ones takes place under these conditions with a rate parameter of about 3 × 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, which has been supported until now by steady-state irradiation experiments only.
|Number of pages||11|
|Journal||Radiation Physics and Chemistry|
|Publication status||Published - Dec 1 1989|
|Event||4th Working Meeting on Radiation Interaction - Some Extended Papers - Leipzig, East Ger|
Duration: Sep 21 1987 → Sep 25 1987
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