Correlation between polypropylene microstructure, cold plasma interaction and subsequent luminescent emission

Tiemblo, Pilar; Gómez‐Elvira, José M.; Teyssèdre, G.; Massines, Françoise; Laurent, Christian

doi:10.1002/(sici)1097-0126(199805)46:1<33::aid-pi964>3.0.co;2-m

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…Time-resolved spectral analysis of the emission has revealed that PIL has three spectral components, each having a different excitation mechanism and thus different kinetics [7,8]. The quickest is due to radiative de-excitation of chromophores which were excited by the active species of the plasma, among which the uv light plays a major role.…”

Section: Discussionmentioning

confidence: 68%

Spectral analysis of optical emission due to isothermal charge recombination in polyolefins

Teyssèdre

Cissé

Laurent

et al. 1998

IEEE Trans. Dielect. Electr. Insul.

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Light emission from electrically stressed polymers, so called electroluminescence, is a subject of great interest because it is associated with electrical aging andl dielectric breakdown of highly insulating materials. Radiative recombination of charge carriers on luminescent centers generally is evoked as the main contribution to the emission, but this is difficult to assess in polyolefins since the spectral features associated with this mechanism are not known. The reason is twofold. First, there is a lack of knowledge on the nature of the luminescent centers in these materials, and second, it is difficult to get wavelengt h-resolved electroluminescence spectra due to the low light level. By using an alternative activation method, we have isolated the emission spectrum associated with isothermal charge recombination in polyethylene and polypropylene. Electrical charges of both polarities are brought to the surface of the samples by contact with a cold plasma powered at a frequency of =5 kHz. The kinetic and spectral features of the recombination-induced emission are recorded after discharge switch off. The recombination mechanism is considered on the basis of the light decay kinetics whereas the chemical nature of the luminescent centers is discussed by a comparison with the photoluminescence spectrum of the polymer. It is shown that charges recombine by tunneling from traps to the luminescent centers which are unsaturated species. The chromophores involved in photo-and recombination-induced luminescence appear to be the same, but not the electronic transitions. Light emitted upon charge recombination has been assigned to transitions from the lowest lying triplet states of poly-enone sequences.

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Section: Discussionmentioning

confidence: 68%

Spectral analysis of optical emission due to isothermal charge recombination in polyolefins

Teyssèdre

Cissé

Laurent

et al. 1998

IEEE Trans. Dielect. Electr. Insul.

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“…The reorientation of polymer chains occurs in the amorphous regions where mobile polar groups migrate or rotate into the bulk. It is well known that oxidation of PO does not take place in the crystalline regions but in amorphous domains,79 and, due to creation of a greater number of oxygenic functional groups in PO with lower crystallinity, the surface modification by corona discharge plasma is more efficient 80,81…”

Section: Discussionmentioning

confidence: 99%

Study of Surface Properties of Polyolefins Modified by Corona Discharge Plasma

Novák

Pollák

Chodák

2006

Plasma Processes & Polymers

112

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Summary: Polyolefin surfaces, namely isotactic poly(propylene) (iPP) and low‐density polyethylene (LDPE), were modified by corona discharge plasma. The chemical changes on the modified surfaces were observed, deeply affecting the surface and the adhesive properties of the studied materials. The hydrophobic recovery in the case of iPP is considerably dependent on the polymer crystallinity. The presence of the processing agents in the LDPE has a significant influence on the surface hydrophobization dynamics.

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“…1D. The general mechanism of PP luminescence is related to the presence of oxygen reacting with the polypropylene [19] and the oxidation can be promoted by presence of ozone, UV radiation, humidity and mechanical stress. The luminescence of PP takes a form of chemiluminescence, plasma-induced luminescence and UV excited fluorescence or phosphorescence [20,21].…”

Section: Ipp Fibers Characterizationmentioning

confidence: 99%

Fluorescence confocal microscopy as effective testing method of polypropylene fibers and single polymer composites

et al. 2016

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Correlation between polypropylene microstructure, cold plasma interaction and subsequent luminescent emission

Cited by 10 publications

References 2 publications

Spectral analysis of optical emission due to isothermal charge recombination in polyolefins

Spectral analysis of optical emission due to isothermal charge recombination in polyolefins

Study of Surface Properties of Polyolefins Modified by Corona Discharge Plasma

Fluorescence confocal microscopy as effective testing method of polypropylene fibers and single polymer composites

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