By G. Scott
This quantity examines the oxidation chemistry of carbon-based fabrics in additional aspect with emphasis at the technological phenomena that end result from the assault of oxygen and the sensible tactics built to avoid them.
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0500Â 4000 3500 3000 \ Sj j 2500 2000 1500 7 1000 8 500 cm Fig. 5. The computer calculated difference spectrum of a used fresh oil. Reprinted with permission © 1983 Society of Automotive Engineers. oxidation, and the increase in the aromatics absorbance for fuel contamina tion. Depletion of the ZDDP and overbased additives is implied from the negative absorbances at 660 cm" 1 ,1000 cm"1 and 1520 cm"1 Work in the 1950s and 1960s showed that sludge and varnish formation in gasoline engines was fuel-derived, with the composition of the fuel, the levels of blow-by and concentrations of NO x and H N 0 3 playing a critical role.
Synthetic poly α-olefin basestocks generally give low levels of deposits and Rakawsky and Mequerion showed that paraffinic basestocks formed very little deposit when oxidised at 400°C, whereas with mixtures of paraffins and aromatics the amount of deposit increased and passed through a maximum as the level of aromatics increased. The ten dency of the aromatics to produce deposits was related to the number of benzylic hydrogens present . 24 T. Oxidized Products —*■ Oil/Additive Degradation (Ring Zone) Condensation Products, Resins Heat NOx Top Groove Fill Varnish Heat Carbon Deposit Scheme 4.
Kreuz and Love  investigated the effect of S0 2 on hydrocarbon oxida tion and the reactions of S0 2 with hydroperoxides in an attempt to under stand more about the effect of sulphur on piston deposits. S0 2 was found to inhibit hydroperoxide formation during the autoxidation of tetralin but small amounts of resinous products were produced. i-Butyl hydroperoxide was rapidly decomposed by S0 2 , and H 2 S0 4 was identified as one of the products of the reaction. The following reactions were proposed: RH Oo ROOH-^- ROOH or ROOR H SO 2 Δ,Η20 ROSO3H *> R 2 C = O H SO 2 H 2 S0 4 1 Aldol condensation products (10) (ID 28 T.