Application of Hydrogen-donating Hydrocarbons as Radical Scavengers.

Kubo, Junichi

doi:10.1627/jpi1958.39.171

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…The HHAP used in these tests consists of multicomponent hydrocarbons produced from petroleum; it has similar properties to the HHAP used in the tests of petroleum products, rubbers, plastics, etc., already reported. The radical-scavenging ability of this HHAP was already proven in the tests with DPPH (2,2diphenyl-1-picrylhydrazyl), as reported in our previous papers (Kubo, 1992a(Kubo, , 1996a. The HHAP was produced by the hydrogenation of a highly aromatic heavy fraction of petroleum, and the properties as a mixture are shown in Table 1.…”

Section: Methodssupporting

confidence: 58%

“…The HHAP was produced by the hydrogenation of a highly aromatic heavy fraction of petroleum, and the properties as a mixture are shown in Table 1. They are deduced to contain the partly hydrogenated products of condensed aromatic rings, and they exhibit radical-scavenging effects due to their hydrogen-donating properties (Kubo, 1992a(Kubo, , 1996a.…”

Section: Methodsmentioning

confidence: 99%

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Inhibition of the Changes in Dielectric Properties Caused by the Oxidation of Hydrocarbons

Kubo¹,

Kubota²

1997

Ind. Eng. Chem. Res.

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The additive effects of multicomponent hydrogen-donating hydrocarbons derived from petroleum (HHAP) on the changes in the dielectric properties caused by the oxidation of hydrocarbons were tested compared with conventional antioxidants, and the following results were obtained: (1) The addition of HHAP to LDPE did not affect the dissipation factor, in contrast to the changes caused by the conventional hindered phenolic and bisphenolic antioxidants. (2) During the oxidation of n-paraffin wax at 160 °C in air, the changes in dissipation factor caused by the oxidation were sufficiently inhibited by the addition of HHAP (1 and 2 wt %). (3) The results of the chemical analyses, including IR, acid value, and oxygen content, were well consistent with the dissipation factor. These outcomes are attributable to the high radical-scavenging ability and the pure hydrocarbon constitution of HHAP, which has no functional groups that contain heteroatoms.

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Section: Methodssupporting

confidence: 58%

Section: Methodsmentioning

confidence: 99%

Inhibition of the Changes in Dielectric Properties Caused by the Oxidation of Hydrocarbons

Kubo¹,

Kubota²

1997

Ind. Eng. Chem. Res.

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“…The HHAP used in these tests consists of multicomponent hydrocarbons produced from petroleum; it has properties similar to those of the HHAP used in the tests of petroleum products, rubbers, plastics, etc., already reported. The radical scavenging ability of this HHAP was already proven in the tests with DPPH (2,2diphenyl-1-picrylhydrazyl), as reported in our previous papers (Kubo, 1992a(Kubo, , 1996a. The HHAP was produced by the hydrogenation of a highly aromatic heavy fraction of petroleum.…”

Section: Methodssupporting

confidence: 54%

“…The HHAP was produced by the hydrogenation of a highly aromatic heavy fraction of petroleum. HHAPs are deduced to contain the partly hydrogenated products of condensed aromatic rings, and they exhibit radical scavenging effects due to their hydrogen-donating properties (Kubo, 1992a(Kubo, , 1996a.…”

Section: Methodsmentioning

confidence: 99%

Oxidation of Hydrogen-Donating Hydrocarbons from Petroleum Related to Its Inhibiting Effect on the Changes in Dielectric Properties

Kubo¹,

Kubota²

1997

Ind. Eng. Chem. Res.

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As the followup to our previous paper, multicomponent hydrogen-donating hydrocarbons derived from petroleum (HHAP) were oxidized at 160 °C in air for 30 h compared with a conventional diphenylamine type antioxidant (Stealer), and the following results were obtained: (1) Judging from the changes in the dissipation factor, carbonyl absorbance by IR, acid value, and oxygen content by elemental analysis, HHAP was barely oxidized under these conditions, although n-paraffin wax was clearly oxidized. (2) Small amounts of oxygen-containing compounds (0.5 wt % in oxygen content), which are acidic materials but not carbonyl compounds, were formed from Stealer under these conditions. (3) In addition to the test results reported in our previous paper, it was reconfirmed by the humidity tests that the oxidation of n-paraffin wax was superbly inhibited by the addition of HHAP, and the dissipation factor was kept low during the humidity tests. With regard to why HHAP was not oxidized under these severe conditions, it was deduced that the free radicals formed from HHAP were stabilized by hydrogen liberated from HHAP itself.

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“…The radical scavenging effects of HHAPs were conventional hindered phenolic antioxidants, and ultraviolet ray absorbents. 13,14 From this table, already confirmed in the reactions with 2,2-diphenyl-1-picrylhydrazyl (DPPH), as already rethe following can be observed. ported.…”

Section: Resultsmentioning

confidence: 56%

Electron-induced crosslinking of polypropylene with the addition of hydrogen-donating hydrocarbons

Kubo

Otsuhata²,

Ikeda³

et al. 1997

J. Appl. Polym. Sci.

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Electron-induced crosslinking of polypropylene with the addition of hydrogen-donating hydrocarbons produced from petroleum (HHAP) together with A-TMPT (trimethylpropanetriacrylate) was studied, and the following results were obtained: (1) Effective crosslinking was achieved at lower doses under 10 kGy. (2) HHAP functions as an effective radical scavenger to suppress scissions. (3) Distinguished improvements in properties such as elongation and heat distortion temperature were achieved by the irradiation. (4) Distinct diminution in melt flow rate and evident increase in average molecular weight with the irradiation at lower doses were observed. (5) It was confirmed that the oxidative degradation during mixing and molding was noticeably inhibited by the addition of HHAP. This effect as an antioxidant during these procedures along with the irradiation seems to be a cause to promote crosslinks. These effects are attributable to the high radical scavenging effects of HHAP and its pure hydrocarbon constitution without functional groups containing heteroatoms.

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Application of Hydrogen-donating Hydrocarbons as Radical Scavengers.

Cited by 6 publications

References 5 publications

Inhibition of the Changes in Dielectric Properties Caused by the Oxidation of Hydrocarbons

Inhibition of the Changes in Dielectric Properties Caused by the Oxidation of Hydrocarbons

Oxidation of Hydrogen-Donating Hydrocarbons from Petroleum Related to Its Inhibiting Effect on the Changes in Dielectric Properties

Electron-induced crosslinking of polypropylene with the addition of hydrogen-donating hydrocarbons

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