Torque-Induced Rotational Dynamics in Polymers: Torsional Blobs and Thinning

Michiel Laleman, Marco Baiesi, Boris P. Belotserkovskii, Takahiro Sakaue, Jean Charles Walter, Enrico Carlon

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4 Citations (Scopus)

Abstract

By using the blob theory and computer simulations, we investigate the properties of a linear polymer performing a stationary rotational motion around a long impenetrable rod. In particular, in the simulations the rotation is induced by a torque applied to the end of the polymer that is tethered to the rod. Three different regimes are found, in close analogy with the case of polymers pulled by a constant force at one end. For low torques the polymer rotates maintaining its equilibrium conformation. At intermediate torques the polymer assumes a trumpet shape, being composed by blobs of increasing size. At even larger torques the polymer is partially wrapped around the rod. We derive several scaling relations between various quantities as angular velocity, elongation, and torque. The analytical predictions match the simulation data well. Interestingly, we find a "thinning" regime where the torque has a very weak (logarithmic) dependence on the angular velocity. We discuss the origin of this behavior, which has no counterpart in polymers pulled by an applied force.

Original languageEnglish
Pages (from-to)405-414
Number of pages10
JournalMacromolecules
Volume49
Issue number1
DOIs
Publication statusPublished - Jan 12 2016

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All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Laleman, M., Baiesi, M., Belotserkovskii, B. P., Sakaue, T., Walter, J. C., & Carlon, E. (2016). Torque-Induced Rotational Dynamics in Polymers: Torsional Blobs and Thinning. Macromolecules, 49(1), 405-414. https://doi.org/10.1021/acs.macromol.5b01481