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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Dynamics of active polar ring polymers.

Christian A Philipps1,2, Gerhard Gompper1, Roland G Winkler1

  • 1Theoretical Physics of Living Matter, Institute of Biological Information Processing and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.

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Summary
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Active polar ring polymers exhibit unique dynamics independent of conformation. Activity influences internal dynamics, creating distinct time regimes like enhanced diffusion and ballistic motion in flexible and semiflexible polymers, respectively.

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Area of Science:

  • Polymer Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Understanding polymer dynamics is crucial in various fields.
  • Active matter systems exhibit self-propulsion and complex behaviors.
  • Semiflexible polymers possess both chain flexibility and orientational order.

Purpose of the Study:

  • Investigate the conformational and dynamical properties of isolated semiflexible active polar ring polymers.
  • Analyze the impact of tangential active forces on polymer ring behavior.
  • Differentiate dynamics between passive and active polymer rings.

Main Methods:

  • Analytical investigation using eigenfunction expansion.
  • Modeling rings as continuous Gaussian polymers.
  • Solving the linear non-Hermitian equation of motion.

Main Results:

  • Ring conformations are independent of activity.
  • Activity significantly alters internal ring dynamics, introducing new time regimes.
  • Flexible rings show activity-enhanced diffusion; semiflexible rings exhibit ballistic motion on intermediate timescales.
  • A second active time regime reveals snake-like motion on longer timescales.

Conclusions:

  • Activity profoundly impacts polymer ring dynamics but not conformation.
  • Distinct dynamical regimes emerge due to active forces, absent in passive systems.
  • The findings provide insights into the behavior of active polymers in complex environments.