Homogeneous and heterogeneous thermal decomposition of diphenyl disulphide

Plaza, S.; Gruziński, R.

doi:10.1016/0043-1648(95)06859-7

Cited by 21 publications

(12 citation statements)

References 15 publications

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“…It is thought that solid phase extraction (SPE) or other pretreatment is the suitable choice for the isolation of DBDS from insulating oil. DBDS improved the lubricant effectiveness of mineral oil, so several researchers reported the mechanism of tribochemical reaction and the thermal decomposition of DBDS [5,6]. Dibenzyl sulfide (DBS) and several compounds have been reported as the by-products generated from the chemical reaction of DBDS with iron.…”

Section: Introductionmentioning

confidence: 99%

Highly sensitive detection method of dibenzyl disulfide and the elucidation of the mechanism

Toyama

Tanimura

Yamada

et al. 2009

IEEE Trans. Dielect. Electr. Insul.

110

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Highly sensitive detection method of dibenzyl disulfide (DBDS) in insulation oil was realized using solid phase extraction (SPE) with active alumina adsorbent followed by gas chromatography equipped with a mass spectrometry (GC-MS). The detection limit of DBDS is around 0.1 ppm. This method is also useful for detecting bibenzyl (BiBZ) and dibenzyl sulfide (DBS). The good relationship between the weight change of copper strip and BiBZ /DBS formation was obtained under heating with insulating oil containing DBDS and copper strip, so it was clarified that BiBZ and DBS are the byproducts of the copper sulfide generation with the chemical reaction between DBDS and copper. The chemical reaction formula between DBDS and copper was proposed based on the assumption that copper sulfide should be generated via Cu-DBDS complex. The temperature dependence of the weight change of copper strip before and after the heating in the insulating oil containing DBDS was quantitatively explained with the chemical reaction formula.

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Section: Introductionmentioning

confidence: 99%

Highly sensitive detection method of dibenzyl disulfide and the elucidation of the mechanism

Toyama

Tanimura

Yamada

et al. 2009

IEEE Trans. Dielect. Electr. Insul.

110

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“…Upon heating in the presence of alkanes, DPDS reacts with alkane decomposition products, as was demonstrated by the formation of alkylphenylsulfides and phenylthiol 30. So, when random scission occurs, DPDS supposedly acts as a radical scavenger.…”

Section: Discussionmentioning

confidence: 95%

“…Devulcanization of peroxide‐cured EPDM in the presence of DPDS enhances devulcanization at 265°C for both types of EPDM, but at 200°C it only does so for HD‐EPDM. A possible explanation is that at 200°C some crosslinking is taking place for ENB‐EPDM, as a result of sulfur liberated from the DPDS under the conditions used as seen by the formation of diphenylmonosulfide 30…”

Section: Discussionmentioning

confidence: 99%

Influence of the diene monomer on devulcanization of EPDM rubber

Verbruggen

Does

Noordermeer

et al. 2008

J of Applied Polymer Sci

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Ethylene-propylene-diene rubbers (EPDM) with 2-ethylidene-5-norbornene (ENB), dicyclopentadiene (DCPD), and 1,4-hexadiene (HD) as third monomers have been vulcanized with peroxide and with a conventional sulfur vulcanization recipe, and their devulcanization was subsequently investigated for recycling purposes. The behavior of these vulcanizates during pure thermal devulcanization depends on the EPDM third monomer and the crosslinker used. Peroxide vulcanizates of ENB-EPDM devulcanize only to a small extent and predominantly by random scission, whereas peroxide vulcanizates of HD-EPDM devulcanize by crosslink scission. In contrast, sulfur vulcanizates of ENB-EPDM, devulcanize mainly by crosslink scission. During devulcanization of sulfur-cured HD-EPDM, scission of both crosslinks and main chains occurs. Sulfur-cured DCPD-EPDM cannot be devulcanized but shows further crosslinking instead. In those cases, where purely thermal devulcanization is already effective to a certain extent, diphenyldisulfide as devulcanization agent increases the effectivity during thermochemical devulcanization. Hexadecylamine as an alternative devulcanization agent is effective for ENB-EPDM but does not contribute to thermochemical devulcanization of HD-EPDM. In summary, devulcanization proceeds by different mechanisms in ENB-EPDM, DCPD-EPDM, and HD-EPDM. Explanations are given in terms of the chemical structures of the third monomers, the corresponding crosslinks, and devulcanization agents.

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“…1) can occur with the formation of a hydrogen peroxide and disulfides as well, which can essentially be called dimerization [43]:…”

Section: The Progress Of the Oxidation Reaction In Homogenous Bitumenmentioning

confidence: 99%

The oxidation of bitumen witnessed in-situ by infrared spectroscopy

2017

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During the production and recycling of asphalt concrete, bitumen in contact with inorganic particles is exposed to air at high temperatures. As a result an oxidation of bitumen, also known as aging, occurs. The reaction between bitumen and air at 163°C was studied insitu with and without the presence of inorganic impurities by means of fourier transform infrared spectroscopy in the attenuated reflectance mode. This oxidation was discovered to be a step-wise reaction facilitated by the oxidation of thiols and creation of peroxides within the system. The rate of reaction was demonstrated to depend on the type of impurity present, of which iron (III) chloride was the strongest catalyst. It was further demonstrated that the oxidation reaction is inhibited by the adsorption of thiol species present in the system on copper particles. Combining copper with the iron (III) chloride-containing system also resulted in the inhibition of signal increase in the sulfoxide region of the spectra. The results of this preliminary research on the bitumen oxidation reaction presented are proposed for further research regarding control of aging of asphalt concrete, especially during the recycling works.

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Homogeneous and heterogeneous thermal decomposition of diphenyl disulphide

Cited by 21 publications

References 15 publications

Highly sensitive detection method of dibenzyl disulfide and the elucidation of the mechanism

Highly sensitive detection method of dibenzyl disulfide and the elucidation of the mechanism

Influence of the diene monomer on devulcanization of EPDM rubber

The oxidation of bitumen witnessed in-situ by infrared spectroscopy

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