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Analysis of local rearrangements in chains during simulation of the plastic deformation of glassy polymethylene

  • Theory and Simulation
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Abstract

A molecular-dynamics simulation of the low-temperature (∼100 K below T g) plastic deformation of glassy polymethylene (PM) was conducted. A model system consisting of 64 chains containing 100 CH2 groups (the united-atoms approach) in each computational cell with periodic boundary conditions was considered. The behavior of 32 such cells was considered. Each cell was subjected to an active isothermal uniaxial compression at a constant temperature of T def = 50 K to a strain of ɛ = 30%. An analysis showed that the inelastic deformation of glassy PM proceeded via nonaffine displacements (“gliding”) of chain fragments comprising 11–13 sites -CH2-. These displacements are correlated and directed mainly along chain axes. Only a small number of conformational rearrangements occur in chains during the deformation of the material. Conformational transitions add only small additional displacements to nonaffine atomic transformations. A free-volume analysis using Voronoi-Delaunay tessellation in the deformed polymer did not show its relation to local plastic rearrangements.

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Authors and Affiliations

  1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia

    I. A. Strelnikov, M. A. Mazo & E. F. Oleinik

  2. Institute of Mathematical Problems of Biology, Russian Academy of Sciences, Institutskaya ul. 4, Pushchino, Moscow oblast, 142290, Russia

    N. K. Balabaev

Authors
  1. I. A. Strelnikov
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  2. N. K. Balabaev
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  3. M. A. Mazo
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  4. E. F. Oleinik
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Correspondence to M. A. Mazo.

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Original Russian Text © I.A. Strelnikov, N.K. Balabaev, M.A. Mazo, E.F. Oleinik, 2014, published in Vysokomolekulyarnye Soedineniya. Ser. A, 2014, Vol. 56, No. 2, pp. 222–231.

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Strelnikov, I.A., Balabaev, N.K., Mazo, M.A. et al. Analysis of local rearrangements in chains during simulation of the plastic deformation of glassy polymethylene. Polym. Sci. Ser. A 56, 219–227 (2014). https://doi.org/10.1134/S0965545X14010088

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  • DOI: https://doi.org/10.1134/S0965545X14010088

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