Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session K32: Polymer Composites and Nanocomposites III: Dynamics
3:00 PM–6:00 PM,
Tuesday, March 5, 2024
Room: 102D
Sponsoring
Unit:
DPOLY
Chair: Robert Ferrier, Michigan State University
Abstract: K32.00003 : Polymer-Filler Competition-Driven Reinforcement Beyond the Payne Effect in Elastomeric Nanocomposites*
3:48 PM–4:00 PM
Presenter:
Pierre Kawak
(University of South Florida)
Authors:
Pierre Kawak
(University of South Florida)
Harshad Bhapkar
(University of South Florida)
David S Simmons
(University of South Florida)
Our previous efforts demonstrate that low-strain reinforcement is driven by 1) a reinforced elastomer due to a reduced composite Poisson ratio, and 2) an initially jammed filler network bearing load. Subsequently, this filler network breaks, which causes the Payne effect. However, this left the origins of lingering reinforcement past ~20% strain unclear. How can non-cohesive nanoparticles bear load?
Here, we report on molecular dynamics simulations of a model nanocomposite under extensional deformation. Our results point to a competition between polymer and filler to contract to restore volume and resist contractile compression, respectively. This competition leads to a reinforced elastomer stress at large strains. These results provide novel insights into the mechanistic origins of reinforcement by nanoparticle addition, contributing to a long-standing theoretical inquiry.
*This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DE-SC0022329.
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