2000
DOI: 10.1063/1.1312839
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Space charge relaxation in polyetherimides by the electric modulus formalism

Abstract: Dynamic electrical analysis shows that at high temperatures (above the glass transition temperature), the electrical properties of polyetherimide are strongly influenced by space charge. In this article we have studied the relaxation of space charge in two commercial varieties of polyetherimide: Ultem 1000 and Ultem 5000. Their conductive properties were determined by dynamic electrical analysis, using the electric modulus formalism. The complex part of the electric modulus was fitted to Coelho’s model which c… Show more

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Cited by 30 publications
(32 citation statements)
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“…The parameter r r decreases when the initial field is increased, so it seems more difficult for carriers to scape from traps when a higher initial potential is applied. As we are working for relatively short times The parameter α can be associated with the sublinear power-law observed in conductivity in the frequency domain [34][35][36][37]. This power-law conduction regime is associated with the slowing down of the relaxation process in the frequency domain as a result of the cooperative effects, in the same way as the KWW function does in the time domain.…”
Section: Dispersive Mobilitymentioning
confidence: 99%
“…The parameter r r decreases when the initial field is increased, so it seems more difficult for carriers to scape from traps when a higher initial potential is applied. As we are working for relatively short times The parameter α can be associated with the sublinear power-law observed in conductivity in the frequency domain [34][35][36][37]. This power-law conduction regime is associated with the slowing down of the relaxation process in the frequency domain as a result of the cooperative effects, in the same way as the KWW function does in the time domain.…”
Section: Dispersive Mobilitymentioning
confidence: 99%
“…Figure 6 shows an Arrhenius plot of the conductivity where it can be seen that it is thermally activated. This increase has been attributed to an increase of carrier mobility [13]. Conductivity can be fitted to The activation energies and preexponential factors can be seen in Table 5.…”
Section: T(ºc)mentioning
confidence: 99%
“…Instead, in the electric modulus it appears as peak allowing an easier interpretation of the data. The electric modulus formalism has been used to study the conductivity relaxation in polymers [13,14], glasses [15], crystals [16], ceramics [17] and composites [18,19], among other materials, as epoxy resines [20].…”
Section: Polyetherimide (Pei) Is An Amorphousmentioning
confidence: 99%
“…Studies on the effects of these parameters could give information on material reliability. Numerous investigations on PEI properties have been made by researchers [1][2][3][4][5][6][7][8][9] . The relaxational behaviour of this material is one of the researched topics.…”
Section: Introductionmentioning
confidence: 99%
“…Polyetherimide (PEI) is suitable for industrial applications, including electrical insulation [1][2][3] . Its properties are influenced by environmental parameters such as radiations, pressure, temperature.…”
Section: Introductionmentioning
confidence: 99%