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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Published on: April 25, 2019

Supercooled liquid dynamics studied via shear-mechanical spectroscopy.

Claudio Maggi1, Bo Jakobsen, Tage Christensen

  • 1DNRF Centre "Glass and Time", IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark. cmaggi@ruc.dk

The Journal of Physical Chemistry. B
|April 16, 2009
PubMed
Summary

This study measured shear modulus in glass-forming liquids using the piezoelectric shear-modulus gauge (PSG) method. Time-temperature superposition (TTS) was observed in some liquids, with deviations suggesting a mechanical beta process in others.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Rheology

Background:

  • Understanding the mechanical properties of glass-forming liquids is crucial for predicting their behavior.
  • Time-temperature superposition (TTS) is a key concept for analyzing the dynamics of these materials.
  • Previous studies suggested a power-law relationship for the high-frequency dielectric response when TTS applies.

Purpose of the Study:

  • To measure dynamical shear modulus in five glass-forming liquids.
  • To investigate the applicability of time-temperature superposition (TTS).
  • To analyze the high-frequency shear loss behavior and test the shoving model.

Main Methods:

  • Utilized the piezoelectric shear-modulus gauge (PSG) method for shear-mechanical spectra measurements.
  • Covered a frequency range from 1 mHz to 10 kHz.
  • Analyzed frequency-dependent response functions and shear-modulus loss-peak positions.

Main Results:

  • Time-temperature superposition (TTS) was obeyed for pentaphenyltrimethyltrisiloxane and 1,2-propanediol.
  • Evidence of a mechanical beta process was found in diethyl phthalate, dibutyl phthalate, and m-touluidine.
  • The high-frequency shear loss exponent was systematically above 0.4, not the predicted 0.5, and the shoving model described data well for liquids without beta relaxation.

Conclusions:

  • The study confirms TTS in specific glass-forming liquids and identifies deviations indicating a mechanical beta process.
  • The high-frequency shear loss behavior deviates from the predicted power-law exponent.
  • The shoving model effectively describes relaxation dynamics in liquids exhibiting TTS without a beta process.