Effect of endothermic reaction associated with glass transition on the breakdown strength of biodegradable polymer films

Kato, Fuki; Matsushita, M.; Omori, S.; Ohki, Yoshimichi

doi:10.1109/tdei.2007.369527

Cited by 10 publications

(1 citation statement)

References 5 publications

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“…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]. 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]. 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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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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Electrical conduction and dielectric relaxation in polyethylene terephthalate succinate

Kato

Ohki

2009

Electrical Engineering Japan

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SUMMARYElectrical conduction and complex permittivity are examined in polyethylene terephthalate succinate, focusing on their relations to dielectric relaxation processes. Both the real and imaginary parts of the complex permittivity, namely, the dielectric constant ε r g and the dielectric loss factor ε r gg , increase with a decrease in frequency, especially at high temperatures. They are both ascribed to the transport of ionic mobile carriers. Namely, the carrier transport forms a conduction current that should contribute to ε r gg . On this occasion, if charge exchange does not occur at the two electrodes, heterocharge layers should be formed before the electrodes. This should increase the charge density on the electrodes, thus contributing to ε r g . In addition to the increase in ε r g and ε r gg due to mobile ions, two relaxation processes, one due to micro-Brownian motion of dipoles and the other due to orientation and magnitude change of the dipole moment induced by two end groups in the polymer main chain, are observed. Corresponding to these two relaxation processes, two thermally stimulated discharge current (TSDC) peaks appear. The two TSDC peaks as well as the increments in ε r g and ε r gg become larger when the crystallinity of the sample decreases.

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Electrical properties of heat‐treated polylactic acid

Shinyama

Fujita

2012

Electrical Engineering Japan

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Polylactic acid (PLA), a biodegradable plastic, has excellent electrical insulation properties at temperatures ranging from room temperature to around 70 °C. At temperatures higher than 70 °C, however, the insulation performance of PLA deteriorates due to its poor heat resistance. In this study, PLA was heat‐treated at 100 °C to endow it with greater heat resistance, and the effects of this heat treatment on the electrical properties of PLA were investigated. Before being subjected to heat treatment, the crystallinity (xc) of PLA was about 6%. After the heat treatment was begun, xc increased in proportion to the heat treatment time, such that measurements revealed that xc had increased to about 42% by 15 minutes after the start of the heat treatment. The temperature dependence of the insulation breakdown strength (EB) of heat‐treated PLA was investigated, and it was found that EB of heat‐treated PLA (PLA‐A) decreases at a more moderate rate at temperatures above 60 °C. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 180(1): 1–8, 2012; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.21272

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Effect of endothermic reaction associated with glass transition on the breakdown strength of biodegradable polymer films

Cited by 10 publications

References 5 publications

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

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

Electrical conduction and dielectric relaxation in polyethylene terephthalate succinate

Electrical properties of heat‐treated polylactic acid

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