A new method for estimating the content of vinyl acetate in ethylene-vinyl acetate copolymer

Izutsu, Tomoyuki; Odaka, Daisuke; Komatsu, Marina; Ohki, Yoshimichi; Mizuno, Maya; Nakamura, Yoshiaki; Chiwata, Naofumi

doi:10.1109/tdei.2015.005546

Cited by 19 publications

(9 citation statements)

References 21 publications

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“…Since the generation and detection of THz waves has recently become much easier with the advent of related technologies, various applications of THz waves, for example, THz absorption spectroscopy have become industrially possible. Various pieces of valuable information on macroscopic molecular structures in inorganic and organic substances, such as lattice vibrations, intermolecular interactions, and skeletal oscillations, can be obtained by analysing THz absorption spectra [12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Broadband FIR absorption spectra of low‐density polyethylene sheets containing six different antioxidants and estimation of their contents by chemometric analysis

Ogishima¹,

Kuroda²,

Hirai

et al. 2019

High Voltage

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Antioxidants are usually added to polymeric insulating materials to suppress oxidative degradation. However, the details of antioxidant added to a polymer are often not disclosed. On the other hand, compared to mid-infrared absorption spectroscopy, terahertz (THz) absorption spectroscopy, and far-infrared (FIR) absorption spectroscopy have not been performed so often. Based on the above backgrounds, six different kinds of antioxidants were added into low-density polyethylene sheets with four different contents, and their THz and FIR absorption spectra were measured. As a result, it has become clear that each antioxidant shows its specific absorption peaks, by which the antioxidants can be identified. Furthermore, the antioxidant content can be estimated by the absorption intensity of the specific peak. A chemometric analysis can make the estimation more accurately than a simple comparison of absorption intensity.

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Section: Introductionmentioning

confidence: 99%

Broadband FIR absorption spectra of low‐density polyethylene sheets containing six different antioxidants and estimation of their contents by chemometric analysis

Ogishima¹,

Kuroda²,

Hirai

et al. 2019

High Voltage

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“…Note that the word "quench" indicates the result of the quenched sample. Likewise, the temperature on the pattern indicates the annealing temperature at which each sample was held for about 30 Secondly, Figure 4 shows DSC heating-run spectra measured for all the samples. As is often observed experimentally, the asreceived spectra were not flat, showing some inclination.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, THz absorption spectroscopy has emerged as a new tool for analyzing the structure of matter, since it can detect non‐destructively various skeletal vibrations and intermolecular vibrations such as lattice vibrations . Since electromagnetic waves in the THz range possess much lower energies than infrared (IR) photons for Fourier transform IR (FTIR) absorption spectroscopy, THz spectroscopy is adequate to the above‐mentioned vibrations with their characteristic energies much lower than those of intramolecular vibrations, for which FTIR is adequate . Namely, FTIR is, in most cases, suitable for observing intramolecular vibrations with wave numbers from 500 to 4000 cm −1 , but not for wave numbers from 20 to 160 cm −1 , which are typically measurable by THz spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

“…[20][21][22][23] Since electromagnetic waves in the THz range possess much lower energies than infrared (IR) photons for Fourier transform IR (FTIR) absorption spectroscopy, THz spectroscopy is adequate to the abovementioned vibrations with their characteristic energies much lower than those of intramolecular vibrations, for which FTIR is adequate. [24][25][26][27][28][29][30][31][32] Namely, FTIR is, in most cases, suitable for observing intramolecular vibrations with wave numbers from 500 to 4000 cm 21 , but not for wave numbers from 20 to 160 cm 21 , which are typically measurable by THz spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz spectroscopic estimation of crystallinity of poly(phenylene sulfide)

Azeyanagi

Ohki

2018

J of Applied Polymer Sci

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As a crystalline polymer, various properties of poly(phenylene sulfide) (PPS) depend on its crystallinity. Evaluation of crystallinity of PPS is examined by terahertz (THz) absorption spectroscopy in this research. For sheets of PPS thermally annealed differently, sharp absorption peaks appearing at 3.2 and 4.2 THz are well proportional to the crystallinity estimated by X‐ray diffraction, differential scanning calorimetry, and Fourier transform infrared (FTIR) absorption spectroscopy. Therefore, THz absorption spectroscopy can be a good tool for estimating the crystallinity of PPS. Especially, it is useful for thick PPS sheets, for which FTIR spectroscopy in transmission mode is difficult to apply due to the saturation of absorbance. Since THz spectroscopy and FTIR spectroscopy are complementary in the vibrations that the two methods can detect, using the two methods should be effective to improve the accuracy of estimation of crystallinity. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46427.

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“…Terahertz radiation and detection are similar to other electromagnetic waves in principle. Still, due to their unique frequency bands, terahertz waves have the characteristics of high penetration, low energy, and transient properties [28]- [30]. Terahertz nondestructive testing technology has considerable application potential due to these characteristics.…”

Section: The Principle Of Terahertz Nondestructive Testing Technologymentioning

confidence: 99%

A Review: Application of Terahertz Nondestructive Testing Technology in Electrical Insulation Materials

Guo¹,

Xu²,

Cai³

et al. 2022

IEEE Access

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As the voltage level of the grid continuously rises, more and more new insulating materials with better performance are put into use. Nevertheless, air gaps often appear in insulating materials due to poor material quality, structural design flaws, etc. High-field-strength air gaps will produce partial discharge or even breakdown, resulting in electrical equipment failure. In addition, during operation, organic insulating materials are simultaneously exposed to high temperatures, mechanical stress, electrical stress, and moisture. Consequently, aging is inevitable. The aging of insulation materials is the root cause of the reduced insulation properties of the degradation of the insulation properties of electrical equipment in long-term operation. In order to improve the safety performance of power equipment and assure the safety of power grids, the detection and identification of internal structural defects and aging states of insulating materials have always been hot issues in related fields. However, structural defects inside the insulation materials used in power equipment, which are tiny (microns to millimeters), are exceedingly challenging to detect. While there are various destructive methods for detecting the aging status, non-destructive in-line inspection methods are still less commonly reported. In recent years, some scholars have begun to try to use terahertz spectroscopy to detect insulating materials. Numerous scholars have discovered that terahertz spectroscopy can not only detect structural defects inside insulating materials but can also detect nondestructive testing on the degree of material aging and even the type of material, which has excellent engineering value and promotion prospects. In order to help relevant researchers understand the application of this emerging technology in the field of insulating materials, this paper reviews the basic principles of terahertz detection and its applications in air gap detection, moisture detection, and aging analysis of insulating materials. Existing problems and future development directions are discussed.

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A new method for estimating the content of vinyl acetate in ethylene-vinyl acetate copolymer

Cited by 19 publications

References 21 publications

Broadband FIR absorption spectra of low‐density polyethylene sheets containing six different antioxidants and estimation of their contents by chemometric analysis

Broadband FIR absorption spectra of low‐density polyethylene sheets containing six different antioxidants and estimation of their contents by chemometric analysis

Terahertz spectroscopic estimation of crystallinity of poly(phenylene sulfide)

A Review: Application of Terahertz Nondestructive Testing Technology in Electrical Insulation Materials

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