The Course of Autoöxidation Reactions in Polyisoprenes and Allied Compounds. I. The Structure and Reactive Tendencies of the Peroxides of Simple Olefins

Farmer, Ernest Harold; Sundralingam, Alvappillai

doi:10.5254/1.3540097

Cited by 5 publications

(1 citation statement)

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“…In fact, because of their divinylmethane structure ( Fig. 1), PUFA are particularly susceptible to hydrogen abstraction by free radical attack becoming themselves free radical intermediates [2]. This re- The CD moiety is a strong chromophore that can be detected spectrophotometrically.…”

Section: Conjugated Fatty Acidsmentioning

confidence: 99%

UV spectral properties of lipids as a tool for their identification

Angioni

Lercker

Frega

et al. 2002

Eur. J. Lipid Sci. Technol.

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Section: Conjugated Fatty Acidsmentioning

confidence: 99%

UV spectral properties of lipids as a tool for their identification

Angioni

Lercker

Frega

et al. 2002

Eur. J. Lipid Sci. Technol.

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The influence of oxygen upon polymerization reactions

Abere¹,

Mark²,

Hohenstein³

1951

J. Biochem. Toxicol.

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The influence of oxygen upon polymerization reactions

Abere¹,

Mark²,

Hohenstein³

1951

J. Appl. Chem.

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Investigations were carried out to measure the influence of varying initial concentrations of oxygen upon the rate of polymerization during the early stages of polymerization of styrene in toluene solution. Likewise, the viscosity‐average molecular weights of the polymers produced were determined and correlated with the changes of the amounts of oxygen initially present.In order to evaluate properly the differences in the length of the inhibition periods caused by the varying amounts of oxygen added, polymerizations of styrene were first carried out in the absence of oxygen. No inhibition period was observed then. The influence of varying amounts of oxygen is shown by an appearance of inhibition periods, the length of which is dependent upon the initial oxygen concentration. The viscosity‐average molecular weights of the resulting polymers also are related to the same quantity. It too can be observed that the velocity of the reactions immediately following the inhibition period is dependent on the amount of oxygen added at the beginning of the reaction.In accordance with evidence produced by other investigators it is assumed that formation of polyperoxides takes place during the inhibition period. All the observed experimental facts can be explained by this assumption. It also is assumed that the decomposition of these polyperoxides causes a decrease in the length of the inhibition periods by producing radicals which can start new polyperoxide chains. The increase in the rate of the polymerizations after the end of the inhibition period above the rate of a thermal polymerization is of course also due to the decomposition of the polyperoxides at that period of the reaction.Thus it is proposed to change the equation, suggested by Bolland and Gee for the relationship between initial oxygen concentration and inhibition period to P = Kt + a where a is a factor dependent on the rate of decomposition of the polyperoxides during the inhibition period, as well as on possible side‐reactions consuming oxygen.

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The Course of Autoöxidation Reactions in Polyisoprenes and Allied Compounds. I. The Structure and Reactive Tendencies of the Peroxides of Simple Olefins

Abstract: The structural changes which occur in olefinic substances when they undergo oxidation by molecular oxygen have never been elucidated, although many of these changes, such as the autoöxidation of drying oils and of rubber, are of enormous practical importance.

Cited by 5 publications

References 0 publications

UV spectral properties of lipids as a tool for their identification

UV spectral properties of lipids as a tool for their identification

The influence of oxygen upon polymerization reactions

The influence of oxygen upon polymerization reactions

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