NDLI: Quantitative Measurements of DP in Cellulose Paper Based on Terahertz Spectroscopy.

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Quantitative Measurements of DP in Cellulose Paper Based on Terahertz Spectroscopy.

Content Provider	Europe PMC
Author	Chen, Qiyu Yang, Lijun Yu, Hua He, Yuxin Liu, Hong Wang, Xuan
Editor	Mei, Hongwei Cheng, Li Meng, Xiaobo
Copyright Year	2023
Abstract	The power transformer is vital to the reliability of the power grid which is most commonly insulated with Kraft paper and immersed in mineral oil, among which the aged state of the paper is mainly correlated to the operating life of the transformer. Degree of polymerization (DP) is a direct parameter to assess the aged condition of insulating paper, but existing DP measurement by viscosity methods are destructive and complicated. In this paper, terahertz time-domain spectroscopy (THz-TDS) was introduced to reach rapid, non-destructive detection of the DP of insulating paper. The absorption spectra of insulating paper show that characteristic peak regions at 1.8 and 2.23 THz both exhibit a log-linear quantitative relationship with DP, and their universalities are confirmed by conducting the above relationship on different types of insulating paper. Fourier transform infrared spectroscopy (FTIR) analysis and molecular dynamics modeling further revealed that 1.8 and 2.23 THz were favorably associated with the growth of water–cellulose hydrogen bond strength and amorphous cellulose, respectively. This paper demonstrates the viability of applying THz-TDS to the non-destructive detection of DP in insulating paper and assigned the vibration modes of the characteristic absorption peaks.
Journal	Polymers
Volume Number	15
PubMed Central reference number	PMC9823725
Issue Number	1
PubMed reference number	36616596
e-ISSN	20734360
DOI	10.3390/polym15010247
Language	English
Publisher	MDPI
Publisher Date	2023-01-03
Access Restriction	Open
Rights License	Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2023 by the authors.
Subject Keyword	insulating paper cellulose degree of polymerization (DP) FTIR spectra molecular simulation terahertz spectroscopy non-destructive detection
Content Type	Text
Resource Type	Article
Subject	Chemistry Polymers and Plastics

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