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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
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Strain-Induced Density Fluctuations in Glassy Polymers.

Mikihito Takenaka1,2, Shin'ya Yoshioka3, Hirofumi Shimizu4

  • 1Institute For Chemical Research, Kyoto University, Uji, Japan.

Macromolecular Rapid Communications
|November 29, 2025
PubMed
Summary
This summary is machine-generated.

Mechanical instability in glassy polymers causes plastic flow. Strain deformation enhances density fluctuations and shear-thinning, consistent with theories on viscosity and density coupling.

Keywords:
Furukawa and Tanaka theoryglassy polymersmall‐angle X‐ray scattering

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Rheology

Background:

  • Deformation of glassy polymers leads to mechanical instability, plastic flow, cavitation, and fracture.
  • Understanding the origins of this mechanical instability is critical for polymer science.

Purpose of the Study:

  • To investigate the relationship between strain deformation and mechanical instability in glassy polymers.
  • To explore the role of density fluctuations and shear-thinning during polymer deformation.

Main Methods:

  • Utilized small-angle X-ray scattering to observe density fluctuations in polymeric glass under strain.
  • Analyzed shear-thinning behavior during deformation experiments.

Main Results:

  • Strain deformation of polymeric glass exhibits significant shear-thinning behavior.
  • Deformation was observed to enhance density fluctuations within the polymer.
  • Results align with theoretical predictions of strain-induced self-amplification of density fluctuations.

Conclusions:

  • The observed enhancement of density fluctuations results from the coupling between the velocity field and density fluctuations.
  • This phenomenon is explained by the Furukawa and Tanaka theory, highlighting the strong density dependence of viscosity in glassy polymers.