Thermally stimulated polarization and depolarization currents in polyethylene terephthalate succinate

Ohki, Yoshimichi; Maeno, Y.; Tanaka, Toshikatsu; Kohtoh, M.; Okabe, Shigemitsu

doi:10.1109/ceidp.2005.1560730

Cited by 4 publications

(5 citation statements)

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“…By dividing this value by the electrode area, the induced polarization P 1Q is estimated as P 1Q = 2.7 × 10 -9 (C/cm 2 ). As reported in our previous paper [8], diethyl hexyl phthalate (DEHP) was detected from the present PLLA sample by a gas-chromatography/massspectrometry analysis. It was also confirmed that this TSDC peak disappeared if the sample did not contain DEHP [8].…”

Section: Resultsmentioning

confidence: 97%

“…As reported in our previous paper [8], diethyl hexyl phthalate (DEHP) was detected from the present PLLA sample by a gas-chromatography/massspectrometry analysis. It was also confirmed that this TSDC peak disappeared if the sample did not contain DEHP [8]. Therefore, the second TSDC peak is likely to be due to dipolar orientation of DEHP, which has two carbonyl bonds (dipole moment: 3.7 × 10 -31 C·m [6]) per molecular weight of 390.…”

Section: Resultsmentioning

confidence: 97%

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Electrical Conduction and Breakdown Properties of Several Biodegradable Polymers

Ohki

Hirai

2007

IEEE Trans. Dielect. Electr. Insul.

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In order to respond to soaring public concern about environmental protection, various biodegradable polymers have been developed. The present paper reports the electrical conduction and breakdown properties of various biodegradable polymers such as poly-L-lactic acid (PLLA), polyethylene terephthalate succinate (PETS), polycaprolactone butylene succinate (PCL-BS), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and polyhydroxybutyrate/valerate (PHB/V) in comparison to those of low-density polyethylene (LDPE). While the permittivity and conductivity of PLLA and PETS are comparable to LDPE, those of PCL-BS and PBS are much higher. The conductivity is also higher in PBSA. This is because PLLA and PETS are in the glass state at room temperature, while PCL-BS, PBS, and PBSA are in the rubber state. Furthermore, PLLA and PETS show a strong temperature dependence of the conductivity, which is divided into two or three regions, and they also show thermally stimulated polarization or depolarization current around their respective glass transition temperatures. In contrast to the large difference in conductivity among different kinds of samples, all the polymers tested have almost similar impulse breakdown strength at room temperature. As for dc or ac breakdown strength, PLLA and PETS show a relatively higher strength than PCL-BS and PBS.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Electrical Conduction and Breakdown Properties of Several Biodegradable Polymers

Ohki

Hirai

2007

IEEE Trans. Dielect. Electr. Insul.

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“…Other works [16][17][18][19][20] have also shown that the gas-barrier and flame-retardant properties of nanocomposites are improved with respect to the base matrix while maintaining the material's biodegradability. As reported by the reviews given above, these bionanocomposites attract a lot of attention from many scientific researchers, but studies of their insulating properties are restricted to polymers like poly-L-lactic acid (PLA) [21][22][23][24][25][26] and rarely PBS. However, compared to PLA/clay nanocomposites or PLA + PHA/clay blends, PBS exhibits a stronger interfacial interaction with the nanoclay, which maintains the electrical properties of the resulting nanocomposites, such as its dielectric constant, while improving mechanical flexibility [8].…”

Section: Introductionmentioning

confidence: 99%

Temperature effects on electric charge transport processes and electron emission in PBS–clay nanocomposites submitted to electron bombardment

Taktak

Fakhfakh

Rondot

et al. 2023

J. Phys. D: Appl. Phys.

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Isothermal conditions effects on the charge transport processes and electron emission properties in polybutylene succinate (PBS) nanoclay composites are investigated. The temperature range used (20°C to 80°C) is close to the conditions of use of materials in many applications (insulation, sensors). These effects are highlighted using an appropriate device, placed in a scanning electron microscope (SEM), allowing measurement of induced currents in an electron irradiated specimen. The experimental results showed that the rise in temperature involves a decrease in the charging ability and an increase in conductivity of PBS nanocomposites. The mobility of charge carriers and its thermal dependency deduced during the discharge step were found to be lower for the nanocomposites. A qualitative analysis, expressed for understanding these observations, is based on the determination of electron trap energy distribution (i.e. density of occupied states). Secondary electron emission yield decreased with increasing temperature. The results help us envision a new class of insulators with improved electrical performances. The operating thermal stress, combined with the absence of trapped charges, allows to reduce the electrical and thermal aging and to ensure consequently the long-term reliability of the insulators (for instance under HV).

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“…It has been found that the mean impulse breakdown strength of PLA is approximately 1.3 times that of XLPE and the accumulation of space charge in PLA is one-half that in XLPE [13]. Matsushita et al have pointed that several biodegradable polymers have relatively low conductivity at room temperature but show rapid increase in the conduction current around their glass transition temperatures [15][16][17]. Matsushita et al have pointed that several biodegradable polymers have relatively low conductivity at room temperature but show rapid increase in the conduction current around their glass transition temperatures [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Space charge is comparatively easier to accumulate in PLA than low-density PE (LDPE), and the PLA is more susceptible to photodegradation by ultraviolet photons [14]. Matsushita et al have pointed that several biodegradable polymers have relatively low conductivity at room temperature but show rapid increase in the conduction current around their glass transition temperatures [15][16][17]. Ohki et al have conducted a series of investigation on the electrical properties of several biodegradable polymers such as poly-L-lactic acid, polycaprolactone butylene succinate, PE terephthalate succinate, and polybutylene succinate: (i) their degradation affected by the water temperature and ultraviolet photon irradiation [18,19]; (ii) the comparison of their dielectric properties by analyzing the relative permittivity, the dielectric loss factors, the conduction current, the breakdown strength, and the partial discharge resistance [20][21][22][23][24]; and (iii) the effects of material properties including endothermic reaction, blending, glass temperature, and crystallinity on the dielectric properties [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Pattern analysis on dielectric breakdown characteristics of biodegradable polyethylene film under nonuniform electric field

Liu

2011

Int. Trans. Electr. Energ. Syst.

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SUMMARY This article presents pattern analysis to identify the dielectric breakdown characteristics of biodegradable polyethylene film under nonuniform electric field affected by the contaminated conditions, with low‐density polyethylene (LDPE) film as the reference. When the specimens were immersed in the electrolyte for different periods, their degradation was observed and the breakdown experiments were carried out by the needle‐plane electrode pattern with the air gap of 10 mm. The breakdown voltage was measured to determine the discharge and breakdown mechanism in the air/film gap under the nonuniform electric field. Meanwhile, the breakdown phenomena were captured by a monocular‐video‐zoom microscope, and the related breakdown characteristics were quantitatively analyzed through the methods of image processing and fractal dimension to establish the relationship between the pattern characteristics of breakdown craters and the dielectric properties. It is found that the morphology of breakdown region and the distribution of discharge profile in relationship with the contaminated levels can provide an optical evaluation method for the insulating materials. Compared with LDPE, biodegradable polyethylene shows the better breakdown endurance. By increasing the electrolyte conductivity and the immersion time, the breakdown voltage, the breakdown area, and the box dimension of the breakdown crater decrease. The breakdown voltage is higher than that of LDPE, whereas the breakdown area and the box dimension are lower. The results obtained indicate that the image–pattern identification technique is fairly well to quantify the breakdown phenomena of polymer films. Both breakdown area and box dimension reasonably give a scale to identify the dielectric properties for further investigation on feasibility of using biodegradable polymers. Copyright © 2011 John Wiley & Sons, Ltd.

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Thermally stimulated polarization and depolarization currents in polyethylene terephthalate succinate

Cited by 4 publications

References 5 publications

Electrical Conduction and Breakdown Properties of Several Biodegradable Polymers

Electrical Conduction and Breakdown Properties of Several Biodegradable Polymers

Temperature effects on electric charge transport processes and electron emission in PBS–clay nanocomposites submitted to electron bombardment

Pattern analysis on dielectric breakdown characteristics of biodegradable polyethylene film under nonuniform electric field

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