Complex permittivity spectra of several insulating polymers at electrical and THz frequencies

Ohki, Yoshimichi; Fuse, Norikazu; Hikosaka, S.; Takemura, Yasuhiro; Mizuno, Maya; Fukunaga, Kaori

doi:10.1109/ceidp.2009.5377894

Cited by 9 publications

(6 citation statements)

References 9 publications

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“…The neat PHBV sample exhibits three relaxations namely the PHBV β-relaxation and α-relaxations, and the MWS relaxation, as shown in Figure 1b. The PHBV β-relaxation is a weak and broad relaxation with a peak maximum at around -30°C, and is attributed to the cooperative motions of the methyl and ester groups [30,33] or torsional vibrations of the main chains in the neighborhood of its local equilibrium conformation [34]. The PHBV α-relaxation accounts for the chain segmental mobility associated with the glass transition temperature and it is a very broad motion which splits into two peaks with maxima at -30 and 20°C.…”

Section: Broadband Dielectric Spectroscopy Of Blends and Nanocompositesmentioning

confidence: 99%

See 1 more Smart Citation

Crystallization and dielectric behaviour of PLA and PHBV in PLA/PHBV blends and PLA/PHBV/TiO2 nanocomposites

Gasmi¹,

Hassan²,

Luyt³

2019

Express Polym. Lett.

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The morphology, crystallization behavior and mechanical properties of PLA, PHBV and their blends and nanocomposites with TiO 2 as filler were investigated. An uncommon morphological change was observed with increasing PLA content in the blends, and this complicated the isothermal crystallization kinetics analyses of the different samples. It was, for example, observed that PLA, which do not normally crystallize during the cooling of the sample, showed isothermal crystallization for certain blend compositions. TiO 2 was found to be mainly present in the PLA phase, which was also confirmed through broadband dielectric analysis. The blend composition, as well as the presence of TiO 2 nanoparticles, had an influence on the cold crystallization of the PLA. The tensile properties changed with blend and nanocomposite composition, and these changes could to a certain extent be related to the respective morphologies. Very little could be said about differences between the melting behavior of the different samples, because the PLA and PHBV melted at almost exactly the same temperature.

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Section: Broadband Dielectric Spectroscopy Of Blends and Nanocompositesmentioning

confidence: 99%

“…interface due to differences in conductivities of these phases [30,33,34]. Figure 4 shows the ε″ and M″ vs. f spectra, over a temperature range of -100 to 150°C, for the 25/75, 50/50, and 75/25 w/w PLA/PHBV blends mixed with 3 phr TiO 2 nanoparticles.…”

Section: Broadband Dielectric Spectroscopy Of Blends and Nanocompositesmentioning

confidence: 99%

Crystallization and dielectric behaviour of PLA and PHBV in PLA/PHBV blends and PLA/PHBV/TiO2 nanocomposites

Gasmi¹,

Hassan²,

Luyt³

2019

Express Polym. Lett.

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“…The samples employed are seven polymers with the basic characteristics [1][2][3][4][5][6] and thickness shown in Table 1: low-density polyethylene (LDPE), atactic polystyrene (APS), syndiotactic polystyrene (SPS), polymethylpentene (PMP), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), and polyimide (PI, Kapton). It should be noted that some of the samples used in this study were processed into films by companies other than the polymer manufacturers, and some polymers were studied jointly with the company.…”

Section: Measurement Samplesmentioning

confidence: 99%

Complex Permittivity Spectra of Various Insulating Polymers at Ultrawide‐Band Frequencies

Ohki

Fukunaga

Mizuno

et al. 2016

Electrical Engineering Japan

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SUMMARYNowadays, trials to use even higher frequencies are pursued to realize high-speed wireless communications. In order to respond to such a trend, dielectric properties of insulating polymers at high frequencies have to be clarified, although the importance of clarifying low-frequency properties is still very high, especially for use as high-voltage insulators. In this regard, complex permittivity spectra from 10 mHz to 4.0 THz were obtained for various insulating polymers. The spectra obtained in the very wide frequency range are important, because they can be a valuable database and they provide various pieces of important information on dielectric characteristics. C⃝ 2016 Wiley Periodicals, Inc. Electr Eng Jpn, 198(3): 11-18, 2017; Published online in Wiley Online Library (wileyonlinelibrary.com).

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“…Since the spectra in the THz frequency band depend on molecular or inter-molecular behaviour, it is considered useful to examine composites or complex polymers, especially organic/inorganic composites, which are often hard to identify with common midinfrared spectroscopy [11,12]. Figure 6a shows the spectra of two types of CaCO 3 ; calcite and aragonite.…”

Section: Spectroscopymentioning

confidence: 99%

“…Research activities include the development of robust, small, and affordable THz sources and detectors at the New Generation Network Research Centre [1][2][3][4][5][6][7][8][9], modelling of THz transmission and industrial applications in the Applied Electromagnetic Research Centre [10][11][12][13][14]. The collaborative research department also conduct a contract research which provides the funding to develop a stand-off gas sensing system [15][16][17][18][19][20], and a stand-off imaging system [21].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Technology Research at NICT

Hosako

Fukunaga

2010

J Infrared Milli Terahz Waves

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The studies on the fifth generation mobile communications system (5G) are being activated more and more toward the launch of service in 2020. In many worldwide 5G-related organizations, the fifth generation mobile forum (5GMF) in Japan for example, novel applications, system requirements, and technologies have been discussed toward 5G. As also shown in IMT VISION finalized by ITU-R WP5D, massive machine type communications and ultra-reliable and low latency communications are also expected in addition to the enhancement of the mobile broadband. This special section is planned to further promote 5G related R&D activities and to achieve the 5G system requirements in the circumstances above. We received 27 paper submissions and accepted 18 papers through the careful and strict review process. In addition, we have invited a couple of papers: one is from 5GMF and the other is from Samsung Electronics R&D Institute (UK), written by the specialists on wireless access and networking technologies for 5G. Finally, as the guest editor-in-chief, I would like to thank all the reviewers and the editorial committee members for their contributions and efforts to publish this special section.

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Complex permittivity spectra of several insulating polymers at electrical and THz frequencies

Cited by 9 publications

References 9 publications

Crystallization and dielectric behaviour of PLA and PHBV in PLA/PHBV blends and PLA/PHBV/TiO2 nanocomposites

Crystallization and dielectric behaviour of PLA and PHBV in PLA/PHBV blends and PLA/PHBV/TiO2 nanocomposites

Complex Permittivity Spectra of Various Insulating Polymers at Ultrawide‐Band Frequencies

Terahertz Technology Research at NICT

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