Terahertz time domain and far-infrared spectroscopies of side-chain electro-optic polymers

Yamada, Toshiki; Kaji, Tatsuru; Aoki, Isao; Yamada, Chikashi; Mizuno, Maya; Saito, Shingo; Tominari, Yukihiro; Tanaka, Shukichi; Otomo, Akira

doi:10.7567/jjap.55.03dc11

Cited by 11 publications

(9 citation statements)

References 29 publications

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“…Upon applying an external electric field, the polarization mechanisms of EP/GF‐X mainly include electronic polarization, atomic polarization, dipole orientation polarization, interfacial polarization, as well as vibration and rotation at molecular energy levels. The latter are classified into resonant response and relaxation response depending on the frequency band of interest 11,53 . Just like in any other GFRP composites, both the dipole orientation and atomic polarizations are considered the most dominant types of polarization in the 10–10 5 Hz frequency range.…”

Section: Resultsmentioning

confidence: 99%

“…The latter are classified into resonant response and relaxation response depending on the frequency band of interest. 11,53 Just like in any other GFRP composites, both the dipole orientation and atomic polarizations are considered the most dominant types of polarization in the 10-10 5 Hz frequency range. This mode of polarization is generally related to the material's polar groups and the ambient temperature.…”

Section: Experimental Dielectric Propertiesmentioning

confidence: 99%

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Toward tailoring the mechanical and dielectric properties of short glass fiber‐reinforced epoxy composites

Nsengiyumva,

Zhong,

Chen

et al. 2023

Polymer Composites

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Glass fiber‐reinforced polymer‐matrix (GFRP) composites are used to manufacture devices such as radomes, electrical insulators, and radar‐absorbing structures, many of which are used in applications with strict mechanical and dielectric property requirements. As such, designs and properties of GFRP composite materials should be regularly improved to guarantee their safe operation and meet their constantly evolving application requirements. In this study, glass fiber (GF) particles and epoxy resin 128 (EP‐128) were used to manufacture high‐performance EP/GF‐X composites with GF particle contents ranging from 5% to 40%. An investigation into their mechanical and dielectric properties revealed that EP/GF‐20 composite specimens presented the best mechanical performance with their bending strength and modulus reaching 159.68 MPa and 6521.92 MPa, respectively, and an average dielectric constant of 4.862 within the 10–105 Hz frequency range. A theoretical analysis of the EP/GF‐X composite specimens' dielectric constants using classic dielectric models based on the Lichtenecker, Bruggeman, Jaysundere‐Smith, and Maxwell‐Garnett rule‐of‐mixture equations indicated that the dielectric model based on the Bruggeman rule‐of‐mixture equation provided the dielectric constants closest to the measured values with a maximum deviation of less than −0.321% for EP/GF‐40 composites. This study provides a feasible strategy to control the mechanical and dielectric properties of GFRP composites.Highlights Glass fiber (GF) particles and epoxy 128 (EP‐128) resin were used to manufacture high‐performance glass fiber‐reinforced epoxy (EP/GF‐X) composites. The composite manufacturing process was carefully controlled to ensure uniform distribution and orientation of GF particles in the EP‐128 resin. The mechanical and dielectric properties of the manufactured EP/GF‐X composites were effectively tailored by controlling the content and distribution of GF particles in the EP‐128 resin matrix. The dielectric constants of the EP/GF‐X composites were measured experimentally and predicted using various theoretical dielectric models. The Bruggeman model provided the dielectric constants of the EP/GF‐X composites closest to the measured values.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Dielectric Propertiesmentioning

confidence: 99%

Toward tailoring the mechanical and dielectric properties of short glass fiber‐reinforced epoxy composites

Nsengiyumva,

Zhong,

Chen

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

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“…Compared with the EO polymers with a poly-methyl-methacrylate backbone that were previously investigated, 24) the absorption coefficient α of the NLO polymer is smaller, and the absorption bands are broader and featureless. Since the polymer backbone of the NLO depicted in Fig.…”

mentioning

confidence: 83%

“…The method of sample preparation for the measurements has been described elsewhere. 24) The NLO polymer has a broad and featureless absorption, and α is smaller than 60, 100 and 180 cm −1 at 0.1-5.0, 0.1-10.0 and 0.1-20.0 THz, respectively; α is very small at 0.1-1.0 THz.…”

mentioning

confidence: 96%

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Terahertz wave detection by the Stark effect in nonlinear optical polymers

Yamada

Kaji

Yamada

et al. 2019

Jpn. J. Appl. Phys.

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We report on terahertz (THz) wave detection by the Stark effect in nonlinear optical (NLO) polymers, which is a type of NLO effect in a resonant condition. We compare THz wave detection by the Stark effect in NLO polymers with that by the EO sampling technique using ZnTe crystals. The differences in the optical geometry and the detection bandwidth between both techniques are also discussed. One of the advantages of THz wave detection by the Stark effect is the wide bandwidth accompanied by gapless in the THz frequency region. Utilizing the Stark effect in NLO polymers provides us with a wide variety of applications for electromagnetic wave detection.

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Energy Absorption Through Radiation in Multilayer Windows for Spacecrafts

Galuppi,

Royer-Carfagni

2024

Aerotec. Missili Spaz.

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The overall heating of satellites operating in low Earth orbit, essentially due to direct radiation from the Sun, terrestrial albedo, and planetary radiation, is well studied, but little is found specifically on transparent plates used for windowing spacecrafts. The most historic material of choice is fused silica; more recently, acrylic glass is being used, but its refractive properties are poorly documented. The effects of electromagnetic waves incident on multilayer windows composed of panes of fused silica or acrylic glass, or a combination of these, are analyzed. Using data of refractive index from the literature, which, however, have been found incomplete and sometimes contradictory, the problem is addressed by accounting for the dependence of transmissivity and absorptivity of each material on the energy spectrum, which is different for solar and planetary radiation. Worked examples show that fused silica allows most radiation to pass directly through, while acrylic glass is characterized by absorption depending on the thickness; this can potentially increase its temperature, posing a problem since the mechanical properties decay at temperatures near $$100 ^{\circ }\textrm{C}$$ 100 ∘ C . This study contributes to the analysis of thermal problems for space windows, of considerable interest since glazing can fail due to thermal shocks, constrained thermal variations, or temperature concentrations.

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Terahertz time domain and far-infrared spectroscopies of side-chain electro-optic polymers

Cited by 11 publications

References 29 publications

Toward tailoring the mechanical and dielectric properties of short glass fiber‐reinforced epoxy composites

Toward tailoring the mechanical and dielectric properties of short glass fiber‐reinforced epoxy composites

Terahertz wave detection by the Stark effect in nonlinear optical polymers

Energy Absorption Through Radiation in Multilayer Windows for Spacecrafts

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