Abstract
Experimental evidence based on the dependence of molecular oxygen isotope enrichment on the oxygen conversion, temperature and kinetic chain length indicate that, in chain processes of polymer oxidation, the elementary, reactions (recombination or disproportionation) of peroxy radicals are responsible for the selection of both 17O and 18O isotopes. The 17O selection is induced by a magnetic isotope effect and is sensitive to the molecular dynamics, while 18O selection is due to a classical mass-dependent isotope effect and is much less effective.
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