To explain the experimental results concluding that the addition of hydrogen donating hydroaromatics can inhibit the deteriorations of such hydrocarbon products as petroleum products, rubbers and plastics, radical scavenging abilities of hydroaromatics toward DPPH (N, N-diphenyl-N'-picrylhydrazyl) were examined. The radical scavenging abilities were judged by the changes of the color (Table 2) of the solution and ESR spectra (Fig. 1-Fig. 4) after 50°C, 3h heating. The results obtained were as follows:
(1) Tetralin, octahydrophenanthrene, synthetic H/D (derived from coal, multi-component, effective toward petroleum products and rubbers) and HHAP (derived from petroleun, multi-component, effective toward rubbers and plastics) were obviously effective to scavenge the radicals.
(2) Naphthalene, phenanthrene and decaline were not effective at all.
(3) The ability of tetralin was not so effective as octahydrophenanthrene, synthetic H/D and HHAP.
These conclusions can explain the previous results obtained by the thermal deterioration tests, and the inhibiting abilities of hydroaromatics toward the hydrocarbon products can be attributed to their radical scavenging abilities.
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