Suppression of Segmental Chain Dynamics on a Particle's Surface in Well-Dispersed Polymer Nanocomposites

Published

June 18, 2024

Author(s)

Jihyuk Kim, Benjamin Thompson, Taiki Tominaga, Takahito Osawa, Takeshi Egami, Stephan Forster, Michael Ohl, Erkan Senses, Antonio Faraone, Norman J. Wagner

Abstract

The Rouse dynamics of polymer chains in model nanocomposite polyethylene oxide/silica nanoparticles (NPs) was investigated using quasielastic neutron scattering. The apparent Rouse rate of the polymer chains decreases as the particle loading increases. However, there is no evidence of an immobile segment population on the probed time scale of tens of ps. The slowing down of the dynamics is interpreted in terms of modified Rouse models for the chains in the NP interphase region. Thus, two chain populations, one bulk-like and the other characterized by a suppression of Rouse modes, are identified. The spatial extent of the interphase region is estimated to be about twice the adsorbed layer thickness, or ≈2 nm. These findings provide a detailed description of the suppression of the chain dynamics on the surface of NPs. These results are relevant insights on surface effects and confinement and provide a foundation for the understanding of the rheological properties of polymer nanocomposites with well-dispersed NPs.

Citation

ACS Macro Letters

Volume

13

Issue

6

Pub Type

Journals

Download Paper

https://doi.org/10.1021/acsmacrolett.4c00168

Local Download

Citation

Kim, J. , Thompson, B. , Tominaga, T. , Osawa, T. , Egami, T. , Forster, S. , Ohl, M. , Senses, E. , Faraone, A. and Wagner, N. (2024), Suppression of Segmental Chain Dynamics on a Particle's Surface in Well-Dispersed Polymer Nanocomposites, ACS Macro Letters, [online], https://doi.org/10.1021/acsmacrolett.4c00168, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=959137 (Accessed December 13, 2024)