Simultaneous measurements of ultrasound attenuation, phase velocity, thickness, and density spectra of polymeric sheets

Kazuto Tsuji; Tomohisa Norisuye; Hideyuki Nakanishi; Qui Tran-Cong-Miyata

doi:10.1016/j.ultras.2019.105974

Simultaneous measurements of ultrasound attenuation, phase velocity, thickness, and density spectra of polymeric sheets

Ultrasonics. 2019 Nov:99:105974. doi: 10.1016/j.ultras.2019.105974. Epub 2019 Aug 9.

Authors

Kazuto Tsuji¹, Tomohisa Norisuye², Hideyuki Nakanishi¹, Qui Tran-Cong-Miyata¹

Affiliations

¹ Department of Macromolecular Science and Engineering, Graduate School of Science & Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
² Department of Macromolecular Science and Engineering, Graduate School of Science & Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan. Electronic address: nori@kit.jp.

PMID: 31430702
DOI: 10.1016/j.ultras.2019.105974

Abstract

The size distribution and mechanical properties of microparticle dispersed in liquid can be characterized by ultrasonic spectroscopy with the aid of acoustic scattering theories. In order to carry out the accurate analysis of the particles, the basic properties, such as the density, viscosity, longitudinal and shear velocities and intrinsic attenuation coefficient of the particle must be known prior to the analysis. Particularly, for soft elastomers or rubbers which exhibit complex mechanical properties with comparable real and imaginary parts, such fundamental information should be provided prior to the particle analysis to minimize the uncertainty of estimation associated with the number of adjustable parameters. In this study, we examined the acoustical properties of poly(methyl methacrylate)(PMMA) and cross-linked poly(dimethyl siloxane) sheets having different cross-linker concentrations by Multiple-Echo Reflection Ultrasonic Spectroscopy which simultaneously enabled us to acquire 4 fundamental properties, the ultrasound attenuation coefficient, phase velocity, density, and thickness (MERUS4 for solid plate). In addition, it was confirmed that the acoustic spectra of PMMA particles dispersed in water were reproduced well with the physical properties determined by MERUS4 using the PMMA plates.

Keywords: Attenuation coefficient; Phase velocity; Ultrasonic spectroscopy; Ultrasound scattering.