Broadband Far-infrared Spectroscopic Identification and Quantification of Antioxidants in Polymeric Insulation

Ogishima, Takaaki; Kozai, Takuya; Hirai, Naoshi; Ohki, Yoshimichi

doi:10.1109/ichve.2018.8641948

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…The present research clearly demonstrates that major absorption peaks in the FT-FIR spectra we showed in our previous papers [22][23][24][25] are due to vibrations of the entire molecular structure, at least as far as the spectra of the three phenol-type antioxidants are concerned. This finding is important not only scientifically but also industrially.…”

Section: Discussionsupporting

confidence: 77%

“…From such a viewpoint, we obtained FT-FIR and THz spectra for more than seven kinds of antioxidants and reported that the two spectroscopic analyses have a potential ability to identify antioxidants even if they have similar structures. [21][22][23][24][25] Furthermore, we have demonstrated that a chemometric analysis can make the identification more reliably even if we do not know a reference spectrum of a pristine polymer with no anitioxidants. 24,25) However, we have not confirmed that the spectra we had obtained truly reflect the molecular structure of each antioxidant.…”

Section: Introductionmentioning

confidence: 92%

“…As reported in our previous papers, [21][22][23][24][25] a low density polyethylene (LDPE) sheet 2.0 mm thick containing uniformly mixed antioxidant with a weight content of 5.0 wt% was used for this research. First, FT-MIR spectra at wave numbers from 400 to 4000 cm −1 were measured for the sheets containing antioxidants, and the absorption coefficient (α) was calculated as a function of wave number for all the sheets.…”

Section: Ft-mir and Ft-fir Spectramentioning

confidence: 99%

See 2 more Smart Citations

Quantum chemical verification of identification of three phenol-type antioxidants by far-infrared absorption spectroscopy

Seki¹,

Endo²,

Hirai

et al. 2020

Jpn. J. Appl. Phys.

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Three different kinds of phenol-type antioxidants were added in low-density polyethylene sheets. Far-infrared and mid-infrared absorption spectra were measured for these sheets and the sheet with no antioxidants to obtain spectra of antioxidants. Furthermore, chemical structures of the antioxidants were optimized by quantum chemical calculations and possible vibrational modes and their energies were calculated numerically. As a result, it was found that our calculations simulate absorption spectra of the antioxidants successfully and that their causal vibrations in the mid-infrared range are consistent with those reported in the literature. Furthermore, it has become clear that all the major far-infrared absorption peaks are due to skeletal vibrations. This clearly explains our previous results that the three antioxidants with very similar structures can be identified by the far-infrared absorption spectroscopy.

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Section: Discussionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 92%

Section: Ft-mir and Ft-fir Spectramentioning

confidence: 99%

See 1 more Smart Citation

Quantum chemical verification of identification of three phenol-type antioxidants by far-infrared absorption spectroscopy

Seki¹,

Endo²,

Hirai

et al. 2020

Jpn. J. Appl. Phys.

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“…From such a background, we reported THz absorption spectra for low-density polyethylene (LDPE) sheets containing nine kinds of antioxidants in our previous paper [27]. Furthermore, we measured absorption spectra of three kinds of phenol-type antioxidants added in LDPE sheets in a broadband FIR range, including both ordinary FIR and THz frequencies [30], and tried to quantify their contents by partial least-squares (PLS) regression, a kind of chemometric multivariate analysis [31]. In this paper, we report similar broadband FIR absorption spectra measured for LDPE sheets containing the remaining six kinds of antioxidants and conduct PLS regression analyses.…”

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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Polymer Composition and Film Morphology Affecting Polypropylene Electret Charge Stability

Henderyckx,

Guliakova,

Rychkov

2024

2024 IEEE 5th International Conference on Dielectrics (ICD)

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Broadband Far-infrared Spectroscopic Identification and Quantification of Antioxidants in Polymeric Insulation

Cited by 3 publications

References 6 publications

Quantum chemical verification of identification of three phenol-type antioxidants by far-infrared absorption spectroscopy

Quantum chemical verification of identification of three phenol-type antioxidants by far-infrared absorption spectroscopy

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

Polymer Composition and Film Morphology Affecting Polypropylene Electret Charge Stability

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