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Origin of the anomalous decrease in the apparent density of polymer gels observed by multi-echo reflection ultrasound

Kohsuke Takeda1, Tomohisa Norisuye, Qui Tran-Cong-Miyata

  • 1Department of Macromolecular Science and Engineering, Graduate School of Science & Technology, Kyoto Institute of Technology Matsugasaki, Sakyo-ku, Kyoto, Japan.

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|February 26, 2013
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Summary

This study refines multi-echo reflection ultrasound spectroscopy (MERUS) to accurately measure material density during gelation. The improved technique corrects for shrinkage-induced errors, enabling precise simultaneous evaluation of attenuation, velocity, and density.

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Area of Science:

  • Materials Science
  • Acoustics
  • Polymer Chemistry

Background:

  • Multi-echo reflection ultrasound spectroscopy (MERUS) measures attenuation, velocity, and density for elastic moduli.
  • Previous MERUS applications showed unphysical density decreases in gelating systems due to polymerization shrinkage.

Purpose of the Study:

  • To refine MERUS for accurate analysis of gelation processes.
  • To address and correct for density measurement errors caused by sample shrinkage.

Main Methods:

  • Developed a MERUS technique accounting for multiply reflecting echoes at the sample-cell wall gap.
  • Systematically obtained corrected densities by incorporating gap interface reflections.

Main Results:

  • Successfully corrected for unphysical density decreases observed during gelation.
  • Obtained systematically corrected densities that align with floating test results.
  • Demonstrated the capability to simultaneously evaluate attenuation, velocity, density, and sample thickness.

Conclusions:

  • The refined MERUS technique accurately quantifies material properties during gelation.
  • This advancement enables precise characterization of solid thin films and other materials.
  • Opens new possibilities for simultaneous measurement of key physical parameters.