On the nature of absorption currents in polyethyleneterephthalate (PET)

Gupta, Dilip; Joyner, K.

doi:10.1088/0022-3727/9/5/016

Cited by 123 publications

(47 citation statements)

References 25 publications

(15 reference statements)

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“…It should be noted that interpretation of the exponent b n is complicated by the fact that polymers exhibit a distribution of relaxation times which, in polyethylene for example, cannot easily be determined at normal temperatures [25].…”

Section: Introductionmentioning

confidence: 99%

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Polyethylene/silica nanocomposites: absorption current and the interpretation of SCLC

Lau

Vaughan

Chen

et al. 2016

J. Phys. D: Appl. Phys.

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The topic of nanodielectrics continues to receive significant attention from today's dielectrics community, due to the property enhancements that can stem from the unique interfacial features within such material systems. Nevertheless, understanding of the interfacial phenomena that occur in nanodielectrics and which determine their electrical behaviour is challenging. In this paper, we report on an investigation into the absorption current behaviour of two nanocomposite systems, one containing an untreated nanosilica and the other containing the same nanofiller chemically modified using trimethoxy(propyl)silane.The results indicate that the absorption current behaviour of all the nanocomposites is very different from that of the reference, unfilled polymer; while the current flowing through the unfilled polyethylene decreased monotonically with time in a conventional manner, all nanocomposites revealed an initial decrease followed by a period in which the current increased with increasing time of electric field application. Possible mechanisms leading to the observed absorption current behaviour in the nanocomposites are discussed with the aid of space charge measurements. The presence of space charge limited conduction (SCLC) and its trap-filled limit is proposed.Keywords: nanocomposites, nanosilica, interface, absorption current, space charge limited conduction. 2 IntroductionThe addition of a nanofiller to a polymer matrix has been shown to be a flexible means of tailoring the dielectric properties of materials [1][2][3] and Chen et al. [19], for example, have emphasized the unsatisfactory nature of our understanding of charge transport mechanisms. In conventional polymeric insulation, charge transport mechanisms are extremely complicated, when compared with many conducting and semiconducting materials [20,21]. In semicrystalline polyethylene, for example, chainfolded lamellar crystals are surrounded by amorphous conformations and there is likely to be a high concentration of traps relating to each of these structural motifs. On the addition of a nanofiller, charge transport mechanisms will become yet more complicated, since the inclusion of nanoparticles will introduce extensive interfacial surfaces between the nanofiller and the polymer. The presence of such interfaces may directly introduce additional nanofiller/polymer trapping sites and/or modify the surrounding polymer morphology, thereby affecting the local density of states within the system.The current flow caused by the action of an applied electric field on charge carriers within a dielectric material can broadly be categorized into three types [22]: the initial current that flows through the material is the capacitive charging current, which causes a dramatic rise at the very beginning of the voltage application. This is followed by a gradual decrease of current, known as the absorption current or the anomalous current. Conventionally, the absorption current decreases slowly until it reaches a quasi-steady state, providing a conduction c...

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Section: Introductionmentioning

confidence: 99%

“…According to Das Gupta and Joyner [25], factors affecting absorption current include electrode polarization, dipole orientation, charge accumulation and trapping, tunnelling of charge carriers from electrodes to empty traps and hopping of charge carriers through localized states.…”

Section: Introductionmentioning

confidence: 99%

Polyethylene/silica nanocomposites: absorption current and the interpretation of SCLC

Lau

Vaughan

Chen

et al. 2016

J. Phys. D: Appl. Phys.

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“…Os resultados são mostrados para diferentes valores de campos elétri-cos. Os pontos foram obtidos a partir das retas logσ versus E 1/2 da Figura 8. É interessante notar que a dependência de Arrhenius 13 , dada por Eq. 2 é obedecida para a amostra F0, sendo também encontrada para a amostra F15 (não mostrada aqui).…”

Section: A Influência Dos Eletrodos Na Conduçãounclassified

Caracterização elétrica e física de compósitos de copolímero EPDM vulcanizado e trihidróxido de alumínio

Zanin

Giacometti

1997

Polímeros

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Apresenta-se neste trabalho a caracterização física e elétrica do elastômero vulcanizado EPDM-ENB (copolímero de etileno-propileno com o dieno de etileno norborneno) carregado com trihidróxido de alumínio (ATH - alumina trihidratada). São determinadas as características do processo de vulcanização, as propriedades mecânicas de rasgamento e de resistência à tração do EPDM com diferentes concentrações de ATH. A dependência da corrente de condução é determinada em função da tensão elétrica aplicada nos compósitos, temperatura e tipos de eletrodos metálicos. Os resultados mostram que a condutividade depende linearmente da raiz quadrada do campo elétrico. A discussão dos processos de condução é feita utilizando os modelos teóricos de Poole-Frenkel e Schottky.

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“…onde, A(T) é a amplitude dependente da temperatura e t é o tempo [3]. Segundo a literatura [3][4], se a amostra for polarizada por um tempo "infinito", a corrente de despolarização é a imagem da corrente de polarização (descontada a corrente estacionária).…”

Section: -A Influência Das Correntes De Absorçãounclassified

“…Segundo a literatura [3][4], se a amostra for polarizada por um tempo "infinito", a corrente de despolarização é a imagem da corrente de polarização (descontada a corrente estacionária). Este fato é importante pois permite isolar a corrente de condução da corrente de absorção.…”

Section: -A Influência Das Correntes De Absorçãounclassified

Propriedades elétricas do elastômero EPDM para aplicação em isolação elétrica

Zanin¹

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On the nature of absorption currents in polyethyleneterephthalate (PET)

Cited by 123 publications

References 25 publications

Polyethylene/silica nanocomposites: absorption current and the interpretation of SCLC

Polyethylene/silica nanocomposites: absorption current and the interpretation of SCLC

Caracterização elétrica e física de compósitos de copolímero EPDM vulcanizado e trihidróxido de alumínio

Propriedades elétricas do elastômero EPDM para aplicação em isolação elétrica

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