Estimation Method of Molecular Weight of Polyethylene using Terahertz Spectroscopy

被引：0
作者：
Kitamura A. [1 ]
Okitsu N. [1 ]
Ikeda M. [1 ]
机构：
[1] Asahi Kasei Corporation, 2-1, Samejima, Fuji
来源：
IEEJ Transactions on Fundamentals and Materials | 2023年 / 143卷 / 05期
关键词：
absorbance spectra; molecular weight; multivariable analysis; polyethylene; terahertz wave;
D O I：
10.1541/ieejfms.143.180
中图分类号：
学科分类号：
摘要：
This paper uses terahertz (THz) spectroscopy for the first time as a simple method for estimating the molecular weight of a polymer across a very wide range. The viscosity average molecular weight (Mv) was measured and estimated as the molecular weight. Currently, to measure the Mv, a sample is dissolved in a solvent then measured its inherent viscosity. However, this procedure is complicated and time-consuming in practice. Additionally, as the molecular weight increases, the measurement accuracy decreases if Mv of a sample is above 3 million. Therefore, a new simple method is desired. A linear high-density polyethylene sample with an Mv range of 0.1 to 7.4 million was used. THz absorbance spectra of the samples were measured from 50 to 600 cm−1 (1.5 to 18 THz) then the multivariable analysis technique was applied. Consequently, a very high correlation coefficient (R2 ≈ 1) between the estimated and the measured Mv values were obtained across the range of the samples. This method is essential and suitable for industrial applications. © 2023 The Institute of Electrical Engineers of Japan.
引用
收藏
页码：180 / 185
页数：5
相关论文
共 17 条
  • [1] (2019)
  • [2] pp. 10-21, (2013)
  • [3] Ohki Y., Applications of THz Spectroscopy and Imaging to the Fields of Electrical Discharges and Dielectric Insulation, JIEED Jpn, 56, 1, pp. 7-16, (2013)
  • [4] pp. 1-7, (2014)
  • [5] 9, pp. 32-37, (2014)
  • [6] Bank M. I., Krimm S., Lattice-frequency studies of crystalline and fold structure in polyethylene, J. Appl. Phys, 39, 11, pp. 4951-4958, (1968)
  • [7] Zirke J., Meissner M., Far-infrared absorbance and thermal properties of polyethylene, Infrared Phys, 18, pp. 871-876, (1978)
  • [8] Calvo-de La Rosa J., Locquet A., Bouscaud D., Berveiller S., Citrin D. S., Terahertz permittivity of pressed ZnO and CuO powder in polyethylene pellets: Effect of porosity, IEEE Trans. Terahertz Sci. & Technol, 11, 4, pp. 402-407, (2021)
  • [9] Komatsu M., Hosobuchi M., Xie X., Cheng Y., Furukawa Y., Mizuno M., Fukunaga K., Ohki Y., Terahertz absorption spectra of oxidized polyethylene and their analysis by quantum chemical calculations, Jpn. J. Appl. Phys, 53, 9, (2014)
  • [10] Stein R. S., Sutherland G. B. B. M., Effect of Intermolecular Interactions between CH Frequencies on the Infrared Spectra of N-Paraffins and Polythene, J. Chem. Phys, 22, 12, pp. 1993-1999, (1954)
12