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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
09:32

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Published on: January 27, 2016

Local polarization fluctuations in an aging glass.

K S Sinnathamby1, H Oukris, N E Israeloff

  • 1Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA.

Physical Review Letters
|August 11, 2005
PubMed
Summary

Aging polymer glasses exhibit increased non-Gaussian noise, indicating stronger correlations. Polarization fluctuations in nanoscale volumes reveal changes in material dynamics during aging after a temperature quench.

Area of Science:

  • Materials Science
  • Polymer Physics
  • Statistical Mechanics

Background:

  • Polymer glasses exhibit complex dynamics near the glass transition.
  • Understanding aging phenomena in amorphous materials is crucial for predicting long-term stability.
  • Nanoscale characterization techniques provide insights into local material behavior.

Purpose of the Study:

  • To investigate polarization fluctuations in polymer glasses during aging.
  • To analyze the statistical properties of noise in equilibrium and aging states.
  • To determine how aging affects the correlations within nanoscale volumes.

Main Methods:

  • Measurement of polarization fluctuations in nanoscale volumes.
  • Temperature quench through the glass transition.

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  • Analysis of noise spectral density and statistical properties (Gaussianity).

    • Main Results:

    • Polarization fluctuations were measured in nanoscale volumes of polymer glass.
    • Noise spectral density showed larger temporal variance during aging.
    • The noise exhibited more non-Gaussian behavior during aging compared to equilibrium.

    Conclusions:

    • Aging in polymer glasses leads to increased temporal variance and non-Gaussian noise.
    • Enhanced non-Gaussianity suggests stronger correlations within nanoscale volumes during aging.
    • These findings provide insights into the dynamic processes governing polymer glass aging.