Analysis of antioxidants in polymers by liquid chromatography

“…It may be possible that this species is responsible for the charge generation observed here as the transit times are similar to those found in [5]. It is interesting to note that antioxidant clusters can cause oxidation [15,16]. Such clusters may be produced if acetophenone solvated the anti-oxidant at high temperature and allowed it to associate.…”

supporting

confidence: 54%

Electric field requirements for charge packet generation and movement in XLPE

See

Dissado²,

Fothergill³

ICSD'01. Proceedings of the 20001 IEEE 7th International Conference on Solid Dielectrics (Cat. No.01CH37117)

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. Permanent repository link ABSTRACTThe formation of space charge packets in XLPE (Cross-linked polyethylene) tapes from unaged cable insulation has been studied utilising the pulsed electro-acoustic (PEA) technique.The 150 m thick sheets were studied under constant applied dc field of 120 kV/mm at a temperature of 20 C for a period of 48 hours. After an inception period of about 3.5 hours, during which heterocharge accumulates at the anode and increases the local field there, a sequence of positive charge packets were observed to transit the sample starting from near the anode. This is shown as a moving image at the following web site: . Calculation of the internal field showed that the packets required a field of 140 kV/mm for their initiation. Reduction of the applied field step-wise from 120 kV/mm to 80 kV/mm indicated that the charge packet would keep moving as long as the local field at its front exceeded 100 kV/mm, but with a reducing magnitude. A return to an applied field of 120 kV/mm confirmed that the local field required to initiate a new packet was in excess of 135 kV/mm. The results are discussed in terms of current theories of charge packet formation. The first packet appears to be a moving front of field ionisation. The generation of subsequent packets is governed by the field at the anode and the balance of charge See, Dissado and Fothergill 9/16/08 2:31 PM 2 injection and extraction process, which occur there. The nature of the negative charges produced at the ionisation front is not clear, but they are unlikely to be electrons.

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“…The analytical procedures used in the determination of antioxidants in polyolefins, and the problems associated with them, have been discussed in several review paper (2)(3)(4). Most modern methods involve the use of high-performance liquid chromatography (HPLC) and differ mainly with regard to the extraction methods and phases used (4)(5)(6)(7)(8)(9).…”

Section: W a L And Giguerementioning

confidence: 99%

“…Most modern methods involve the use of high-performance liquid chromatography (HPLC) and differ mainly with regard to the extraction methods and phases used (4)(5)(6)(7)(8)(9). HPLC has also been employed for the analysis of some organic peroxides (10)(11)(12)(13).…”

Section: W a L And Giguerementioning

confidence: 99%

Simultaneous Determination of the Antioxidant, the Crosslinking-Agent and Decomposition Products in Polyethylene by Reverse-Phase HPLC

Duval

Giguère

1982

Journal of Liquid Chromatography

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A method has been developed for the extraction and analysis of the antioxidant, the peroxide crosslinking agent and some decomposition products in crosslinked polyethylene. The method involves the use of high-performance liquid chromatography (HPLC) in the reverse-phase mode, with a mixture of methanol and water as the mobile phase. Samples of polyethylene are ground at low temperature into a fine powder prior to extraction by methanol. The accuracy and sensitivity limits are given for each of the separated components.

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Analysis of antioxidants in polymers by liquid chromatography

Cited by 19 publications

References 23 publications

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Electric field requirements for charge packet generation and movement in XLPE

Simultaneous Determination of the Antioxidant, the Crosslinking-Agent and Decomposition Products in Polyethylene by Reverse-Phase HPLC

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