Issue 2, 2022

Controlling toughness of polymer-grafted nanoparticle composites for impact mitigation

Abstract

Toughness in an entangled polymer network is typically controlled by the number of load-bearing topological constraints per unit volume. In this work, we demonstrate a new paradigm for controlling toughness at high deformation rates in a polymer-grafted nanoparticle composite system where the entanglement density increases with the molecular mass of the graft. An unexpected peak in the toughness is observed right before the system reaches full entanglement that cannot be described through the entanglement concept alone. Quasi-elastic neutron scattering reveals enhanced segmental fluctuations of the grafts on the picosecond time scale, which propagate out to nanoparticle fluctuations on the time scale 100s of seconds as evidenced by X-ray photon correlation spectroscopy. This surprising multi-scale dissipation process suggests a nanoparticle jamming–unjamming transition. The realization that segmental dynamics can be coupled with the entanglement concept for enhanced toughness at high rates of deformation is a novel insight with relevance to the design of composite materials.

Graphical abstract: Controlling toughness of polymer-grafted nanoparticle composites for impact mitigation

Supplementary files

Article information

Article type
Communication
Submitted
05 Oct 2021
Accepted
10 Dec 2021
First published
13 Dec 2021

Soft Matter, 2022,18, 256-261

Controlling toughness of polymer-grafted nanoparticle composites for impact mitigation

S. H. Chen, A. J. Souna, S. J. Stranick, M. Jhalaria, S. K. Kumar, C. L. Soles and E. P. Chan, Soft Matter, 2022, 18, 256 DOI: 10.1039/D1SM01432C

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