2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 8-9, 20148aA-1
September 8th (Mon.), <10:00-12:00>
Room 1

Helix-Sense Inversion of Poly(β-Phenethyl L-Aspartate) andPiezoelectricity.
○Kazuhiro TANIMOTO*,***, Nariaki ITO**, Kouki SHIBATA**, Hidemine
FURUYA**, Akihiro ABE**, Hisayoshi NISHIZAKI*, Teruyuki TADA*, Yuki
SHIOMI*, Munehiro DATE****, Eichi FUKADA**** and Yoshiro TAJITSU**Graduate School of Engineering, Kansai University **Mitsui Chemicals, Inc.
***Graduate School of Science and Engineering, Tokyo Institute of Technology****Kobayashi Riken

Abstract:
It has been reported that poly(β-phenethyl L-aspartate) (PPLA) exhibits
irreversibly inversion from right-handed to left-handed helixes in a solid state at
130-140 °C. On the other hand, semicrystalline chiral polymers show shear
piezoelectricity. We measured the temperature dependence of piezoelectricity
of PPLA film. As a result, PPLA showed shear piezoelectricity and sign
inversion of the piezoelectric constant at approximately 140 °C. Our results
imply that the orientation was maintained after the sign inversion.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 20148aA-2
September 8th (Mon.), <10:00-12:00>
Room 1High Piezoelectirc Performance of Poly(lactic acid)Film
Manifactured by Solid State Extrusion and the High-order
Structure by POM Observation○Mitsunobu Yoshida*, Takayuki Onogi*, Katsuki Onishi*, Hideyuki Sugitani,Teruyuki Tada, Syota Hayashi, and Yoshiro Tajitsu*○*Mitsui Chemicals Inc., **Graduate School of Engineering, Kansai University

Abstract:
Recently, the development of a speaker, an actuator, and a pressure
sensor using a piezoelectricity of uniaxial stretching poly(L-lactic acid);(PLLA) film has been progressed. However, the shear piezoelectric
constant d14 of a conventional uniaxial stretched PLLA film is 6-10pCN-1 that issomewhat insufficiency for the applications. Therefore, further improvement isdesired. In this study, we carried out solid-state extrusion (SSE) to stretch andorient poly(D-lactic acid) (PDLA) and verified its effects on piezoelectricperformance. By using the SSE, we succeeded in increasing the piezoelectric
constant of PLLA to 20 pCN-1 or more.
And we investigated high-order
structure of stretched film by polarization microscope (POM).

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aA-3
September 8th (Mon.), <10:00-12:00>
Room 1

Recharge of Electret Filter after Washing by Triboelectric
Charging○Yasuhiro NAKAMURA, Yasutaka INANAGA and Koji OTA

Mitsubishi Electric Co. Advanced Technology R&D Center.

Abstract:
Privately held

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aA-4
September 8th (Mon.), <10:00-12:00>
Room 1

Thermal Endurance of Nano-composite Insulating Materialof LDPE andAl2O3 Composed by Mixed Addition with Azobenzoiccompound,
Yoshiaki Yamano
Faculty of Education Chiba University

Abstract:
This report presents test results after 5200 h from the start of thermal
endurance test (aging test) on an insulating material of nano-composite with
mixed addition. The nano-composite with mixed addition is originally designed toobtain a basic concept for long term endurance to electrical treeing deterioration.
The composite was prepared by a mixed addition of azobenzoic compound andAl2O3 nano-particle into LDPE. 4'-hydroxyazobenzene-2-carboxylic acid(‘hc_Ab’) was chosen as a candidate. Experimental results with test materials
before the aging test showed that an incubation time from voltage application totree appearance was almost 1000 times longer than that for the base polymer
under the constant applied voltage. The aging test is carrying out undertemperatures, 87 °C, 92 °C and 95 °C. Properties for evaluations of theendurance are change in weight, resistance, UV absorption characteristics, etc.
After 5200 h from the start of the aging, a change of 0.5 % in weight wasdetected with the mixed addition stored at 92 °C. By contrast, the change of thebasic polymer was 2 %. The incubation time of the mixed addition was kept
almost unchanged by the aging of5200 h. The other properties with the test material were not reached tothe end points which were defined in IEC 60216.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aA-5
September 8th (Mon.), <10:00-12:00>
Room 1

Study on the Dielectric Properties of Composite Materials○Sou KATOU*，Hanzhi YANG*,Mahmudul KABIR*,Masafumi SUZUKI*Miyuki
OGISHIMA**,Akihisa KUWAKI***Graduate School of Engineering and Resource Science Akita University，**SWCC SHOWA CABLE SYSTEMS CO., LTD.

Abstract:
This research work deals with the dielectric properties of composite
materials made of epoxy resin and ZnO micro varistors. We measured thedielectric properties of the samples with temperature and humidity. The dielectric
permittivity of the samples was calculated and we found that not only thetemperature rise but also the change in humidity is responsible of changing thedielectric permittivity of the composite materials.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aA-6
September 8th (Mon.), <10:00-12:00>
Room 1

Making of Rotation Symmetry Equivalent Circuit Model andStudy of Loss Current at Low Growth of Water Tree
○Yuta SAITO, Masafumi SUZUKI

Graduate School of Engineering and Resource Science

Abstract:in this study, we made a rotation symmetry equivalent circuit model ofXLPE sheet degraded by water tree. Since the number of partitions was wellenough for the above sheet, the circuit can evaluate even the 10% growth ofwater tree in the sample. Gradually, the loss current at low growth of water tree
was analyzed. As a result, the peak value of the third harmonic current was
found increased but delay in phase was found at the same harmonic current withthe growth of water tree.

2014 Annual Meeting of The Institute of Electrostatics JapanHiroshima International University
September 7-8, 2014

8aA-7
September 8th (Mon.), <10:00-12:00>
Room 1

Corona Discharge from a Water Droplet without Disruption
Formed at a Tip of a Capillary Tube
○Takuya Nakajima, Yoshio Higashiyama

Graduated School of Science and Engineering, Yamagata University

Abstract:
Current waveform of negative corona discharge from a water droplet
formed at a capillary electrode consists of the repetitive pulse groups due torepetitive formation and disruption of a Taylor cone. Occurrence frequency ofpulse group would be governed by vibrating frequency of a tip of the droplet
during corona discharge. Disruption of the water droplet appears as the large
first pulse in a pulse group. The waveform without the first pulse in each pulse
group was accidentally observed. This means that and disruption of a Taylor
cone would never occur. The vibrating frequency of a water droplet during
corona discharge involving without the large first pulse in a pulse group varies
from 2 to 4kHz and is strongly affected by an applied voltage, while corona
discharge involving with the first pulse keeps almost constant at around 2kHz
independent of the magnitude of applied voltage. Although the height of thecorona pulse group without the first large pulse is a fourth or fifth of that with thefirst pulse, the charge quantity released during a single pulse group in bothcorona discharge aspect is almost the same.