Time-resolved characterization of radiation-generated species in molten polyethylene

O. Brede, R. Hermann, L. Wojnarovits, L. Stephan, T. Taplick

Research output: Contribution to journalArticle


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.

Original languageEnglish
Pages (from-to)403-413
Number of pages11
JournalInternational Journal of Radiation Applications and Instrumentation. Part
Issue number3
Publication statusPublished - 1989

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