Abstract
Radical intermediates formed by UV irradiation of LDPE in the presence of benzophenone (BP) as a photoinitiator have been trapped by using 2,3,5,6-tetramethylnitrosobenzene (ND) end 2,4,6-tri-tert-butylnitrosobenzene (BNB) as spin-trapping reagents. Two kinds of spin-adducts are detected and identified by ESR spectroscopy: a tertiary carbon radical and a secondary carbon radical which ere formed by eddition of the spin traps (ND or BNB) to two polymer radicals. These intermediates are produced by hydrogen abstraction of the BP excited state from branch points and methylene groups of the LDPE chain
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