Dielectric properties of biodegradable polylactic acid and starch ester

Hirai, Naoshi; Maeno, Y.; Tamura, Hitoshi; Kaneko, Daisaku; Tanaka, Toshikatsu; Ohki, Yoshimichi; Kohtoh, M.; Okabe, Shigemitsu

doi:10.1109/icsd.2004.1350296

Cited by 16 publications

(10 citation statements)

References 5 publications

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“…However, their applicability to the electrical insulation field has not been clarified yet. Among many biodegradable polymers, only PLLA has been examined on some dielectric properties [1][2][3][4][5]. However, there has been almost no research that compares dielectric properties of different biodegradable polymers systematically.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Electrical Conduction and Breakdown Properties of Several Biodegradable Polymers

Ohki

Hirai

2007

IEEE Trans. Dielect. Electr. Insul.

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“…Depending on its molecular weight and crystallinity, PLA can exhibit significantly different electrical characteristics. However, PLA has been reported to possess a dielectric constant of 2.3 [35].…”

Section: Fabrication and Measurementsmentioning

confidence: 99%

A Monolithically BST-Integrated $K_{a}$ -Band Beamsteerable Reflectarray Antenna

Karnati

Trampler

Gong

2017

IEEE Trans. Antennas Propagat.

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A 5×9 beamsteering reflectarray operating at Ka band is presented in this paper. Continuous beamsteering is achieved through the use of Barium Strontium Titanate (BST) technology. BST is monolithically integrated into each unit cell using clean room fabrication techniques. With the application of DC bias voltage, an integrated tunable capacitor is realized. The unit cell design utilized in this reflectarray is analyzed and multiple biasing schemes are assessed. The reflectarray is designed to scan in the E-plane only, and is evaluated using fullwave simulations and measurements. An appropriate feeding structure is designed and fabricated using a fused filament deposition 3-D printer, with micrometer stages used to make fine adjustments for final alignment. Overall a gain of 8.3dBi, with a 1-dB bandwidth of 2% and continuous beamscanning from 0 to 25 o at 32GHz is demonstrated.Index Terms-beam steering, ferroelectric films, microstrip antennas, reflectarray antenna, sputtering, tunable circuits and devices.

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“…Compared with LDPE, abundant C=O and OH groups in the starch additives in BDPE can play some role in the charge accumulation, that is, act as the trapping centers to trap the positive charges or assist their trapping at much deeper positions inside the sample near the electrode [38,39]. This is because starch additives enhance the endurance properties of temperature and the electron collision of crystal lattice, which will enhance the breakdown endurance.…”

Section: Breakdown Characteristicsmentioning

confidence: 99%

“…The basic electrical insulation properties such as volume resistivity, dielectric constant, dielectric loss tangent, space charge accumulation, conduction current, and resistance to ultraviolet photons of polylactic acid (PLA) at room temperature have been measured and compared with the present insulating materials including cross-linked PE (XLPE), PE, and polypropylene [10][11][12][13][14]. The basic electrical insulation properties such as volume resistivity, dielectric constant, dielectric loss tangent, space charge accumulation, conduction current, and resistance to ultraviolet photons of polylactic acid (PLA) at room temperature have been measured and compared with the present insulating materials including cross-linked PE (XLPE), PE, and polypropylene [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…The basic electrical insulation properties such as volume resistivity, dielectric constant, dielectric loss tangent, space charge accumulation, conduction current, and resistance to ultraviolet photons of polylactic acid (PLA) at room temperature have been measured and compared with the present insulating materials including cross-linked PE (XLPE), PE, and polypropylene [10][11][12][13][14]. 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]. 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].…”

Section: Introductionmentioning

confidence: 99%

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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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Dielectric properties of biodegradable polylactic acid and starch ester

Cited by 16 publications

References 5 publications

Electrical Conduction and Breakdown Properties of Several Biodegradable Polymers

Electrical Conduction and Breakdown Properties of Several Biodegradable Polymers

A Monolithically BST-Integrated $K_{a}$ -Band Beamsteerable Reflectarray Antenna

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

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