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A topologically driven glass in ring polymers.

Davide Michieletto1, Matthew S Turner2

  • 1School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom; davide.michieletto@ed.ac.uk m.s.turner@warwick.ac.uk.

Proceedings of the National Academy of Sciences of the United States of America
|April 28, 2016
PubMed
Summary
This summary is machine-generated.

We discovered a new type of glass transition in ring polymers. Topological constraints in concentrated solutions create arrested states above the classical glass transition temperature.

Keywords:
glass transitionmolecular dynamicsring polymerstopological glasstopology

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Area of Science:

  • Polymer Physics
  • Soft Matter Physics
  • Materials Science

Background:

  • The properties of ring polymers in concentrated solutions are poorly understood.
  • The mechanism of the glass transition in polymers remains a significant challenge in physics.

Purpose of the Study:

  • Investigate a novel glass transition in circular polymer systems.
  • Explore the role of topological constraints in concentrated ring polymer solutions.

Main Methods:

  • Studied systems of circular polymers.
  • Exploited topological constraints inherent in concentrated ring solutions.
  • Induced kinetically arrested states by pinning a fraction of rings.

Main Results:

  • Demonstrated strong interpenetration and topological interactions between ring polymers.
  • Observed a significant impact of these interactions on polymer dynamics.
  • Showed that pinning a small fraction of rings induces a glass transition above the classical temperature.

Conclusions:

  • Ring polymers form extensive networks of topological interactions in concentrated solutions.
  • A novel, topologically induced glass transition exists in these systems.
  • Kinetically arrested states can be achieved through topological constraints.