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Rupture dynamics in model polymer systems.

Rupam Borah1, Pallavi Debnath1

  • 1Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, India. pdebhfcy@iitr.ac.in.

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Summary
This summary is machine-generated.

This study models polymer rupture dynamics to understand friction at the single polymer level. Sequential bond rupture creates propagating fronts, with a derived velocity formula matching simulations.

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Area of Science:

  • Polymer physics
  • Friction and wear
  • Statistical mechanics

Background:

  • Understanding friction at the microscopic level is crucial for material science.
  • Existing models often simplify the complex dynamics of polymer chains under stress.
  • Investigating polymer rupture provides insights into material failure and wear mechanisms.

Purpose of the Study:

  • To explore the rupture dynamics of a model polymer system at the single polymer level.
  • To capture the microscopic mechanisms governing relative motion of surfaces.
  • To develop and validate a theoretical framework for polymer rupture fronts.

Main Methods:

  • Simulated a generalized bead-spring polymer model attached to a substrate, with stochastic bond rupture.
  • Developed a mean-field formalism to analyze rupture fronts and coupled bead-bond dynamics.
  • Employed a travelling wave formalism (Tanh method) to derive rupture front velocity.

Main Results:

  • Simulations revealed a sequential rupture mechanism leading to rupture fronts under specific parameters.
  • Mean-field theory and numerical solutions aligned well with simulation results.
  • A closed-form expression for rupture front velocity showed good agreement with simulation and mean-field results.

Conclusions:

  • The model successfully captures sequential rupture and propagating fronts in polymer systems.
  • The derived velocity expression provides a reliable prediction for rupture front speed.
  • The study offers a framework for understanding polymer chain dynamics during surface interactions and material failure.