Weak nonlinearities in viscoelastic mechanical properties of polymers near their glass transition: Local versus macroscopic laws for stress-induced acceleration of the mechanical response

Aude Belguise, Sabine Cantournet, François Lequeux, and Hélène Montes
Phys. Rev. Materials 5, 033601 – Published 3 March 2021

Abstract

We focus on the role of dynamical heterogeneities on the weak mechanical nonlinearities of amorphous polymers near and above the glass transition temperature Tg by combining experiments and numerical coarse-grained simulations. The acceleration of the macroscopic nonlinear modulus relaxation resulting from the applied stress is measured below yielding. As a result of dynamic disorder, the macroscopic acceleration differs from the local acceleration. We obtain a good agreement of experimental measurements with simulations computed by using an exponential function of the square stress for the local acceleration. Further, the length scale of dynamical heterogeneities is deduced.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
4 More
  • Received 19 June 2020
  • Accepted 16 February 2021

DOI:https://doi.org/10.1103/PhysRevMaterials.5.033601

©2021 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft Matter

Authors & Affiliations

Aude Belguise1,2, Sabine Cantournet2, François Lequeux1, and Hélène Montes1

  • 1UMR 7615, SIMM, ESPCI PSLCNRS UPMC, 10 Rue Vauquelin, 75005 Paris, France
  • 2PSL University, Mines ParisTech, Centre des Matériaux, CNRS 7633 BP 87, F-91003 Evry, France

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 5, Iss. 3 — March 2021

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Materials

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×