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Glassy dynamics in two-dimensional ring polymers: size versus stiffness polydispersity.

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Polydispersity in soft glassy materials affects dynamics differently based on whether particle stiffness or size varies. Stiffness variation leads to ordered structures and slower dynamics, while size variation creates distinct populations that influence relaxation pathways.

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Area of Science:

  • Soft Matter Physics
  • Polymer Science
  • Materials Science

Background:

  • Soft glassy materials are composed of deformable objects.
  • Understanding the influence of polydispersity on their dynamics is crucial.

Purpose of the Study:

  • Investigate how polydispersity in particle stiffness or size affects the onset of glassy dynamics.
  • Model system: two-dimensional assembly of semi-flexible ring polymers.

Main Methods:

  • Computational simulations at fixed polydispersity (30%).
  • Analysis of ring conformations, orientational order, and bond relaxation pathways.
  • Mapping local correlations between ring shape, order, and mobility.

Main Results:

  • Stiffness dispersity induces elongated conformations and orientationally ordered structures, causing dynamical slowing.
  • Size dispersity creates a bimodal population (small circular, large elongated rings), leading to frustration and delayed arrest.
  • Distinct dynamical heterogeneity pathways observed: long-lived domains (stiffness) vs. percolating relaxation (size).

Conclusions:

  • The nature of polydispersity (stiffness vs. size) dictates relaxation pathways in soft glasses.
  • Stiffness dispersity results in structure-sensitive dynamics.
  • Size dispersity activates motion from both circular and elongated populations, influencing emergent glassy dynamics.