Simultaneous determination of the content and activity of sterically hindered phenolic and amine stabilizers by means of an oxidative model reaction

Radical scavenging efficiency of different fullerenes C60–C70 and fullerene soot

“…4), they resemble typical kinetic curves of oxidation in the presence of basic antioxidants -phenols or amines [62,63,67,69,70,73,74]. In this case the following simple scheme and related kinetic expressions are valid [62,63,65,67,69]:…”

“…In the steady state condition an oxidation reaction rate fitting Scheme 1 is described by the following equation [34,67,69]:…”

“…The rate of oxidation was evaluated from the amount of oxygen consumed, which was measured volumetrically with the simple equipment as described in [63,67,68]. Oxidation rates were assessed both from the slopes of the kinetic curves of oxygen consumption in the case of steady rate values and also by means of differentiating the curve in the case of an observed induction period.…”

Antioxidant capacity of novel amine derivatives of buckminsterfullerene: Determination of inhibition rate constants in a model oxidation system

“…In our previous work we have clearly shown that the model oxidation relates to the onward assays which is effectively used for the determination of the kinetic parameters of both chain breaking antioxidants acting as acceptors of alkyl R and/or peroxy RO 2 radicals [1,[43][44][45][46][47][48]. To make the determination of kinetic parameters the model reaction of cumene initiated (initiator is 2,2 0 -azobisisobutyronitrile, AIBN) oxidation was designed to proceed under steady state conditions with long kinetic chains at moderate temperatures (40-80 C) where cumylhydroperoxide does not contribute additionally to the initiation of oxidation and air oxygen pressure is sufficient not to limit the process [Po 2 ¼ 20 kPa (z10 À3 mol O 2 l À1 )] [49,50].…”

Comparative Catalytic Activity of Metal-Containing Catalysts of Different Nature in the Liquid-Phase Aerobic Oxidation of Ethylbenzene

“…"The rate of oxidation was evaluated from the amount of oxygen consumed, which was measured volumetrically with the simple equipment" as shown in Fig. (2) and described in [18][19][20][21]. Oxidation rate values were calculated from slopes of kinetic curves of oxygen consumption.…”