Nonmonotonic dependence of polymer-glass mechanical response on chain bending stiffness

Christopher Ness, Vladimir V. Palyulin, Rico Milkus, Robert Elder, Timothy Sirk*, Alessio Zaccone

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate the mechanical properties of amorphous polymers by means of coarse-grained simulations and nonaffine lattice dynamics theory. A small increase of polymer chain bending stiffness leads first to softening of the material, while hardening happens only upon further strengthening of the backbones. This nonmonotonic variation of the storage modulus G' with bending stiffness is caused by a competition between additional resistance to deformation offered by stiffer backbones and decreased density of the material due to a necessary decrease in monomer-monomer coordination. This counterintuitive finding suggests that the strength of polymer glasses may in some circumstances be enhanced by softening the bending of constituent chains.

Original languageEnglish
Article number030501
Number of pages5
JournalPhysical Review E
Volume96
Issue number3
DOIs
Publication statusPublished - 13 Sep 2017

Keywords

  • MOLECULAR-DYNAMICS SIMULATION
  • TRANSITION

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