Strong Reduction in Amplitude of the Interfacial Segmental Dynamics in Polymer Nanocomposites

Popov, Ivan; Carroll, Bobby; Bocharova, Vera; Genix, Anne-Caroline; Cheng, Shiwang; Khamzin, Airat; Kisliuk, Alexander; Sokolov, Alexei P.

doi:10.1021/acs.macromol.0c00496

Strong Reduction in Amplitude of the Interfacial Segmental Dynamics in Polymer Nanocomposites

Journal Article · Tue May 05 00:00:00 EDT 2020 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.0c00496· OSTI ID:1631231

^[1]; ^[2]; ^[1]; Genix, Anne-Caroline ^[3]; ^[4]; Khamzin, Airat ^[5]; Kisliuk, Alexander ^[1]; ^[6]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics
Montpellier Univ. 2 (France)
Michigan State Univ., East Lansing, MI (United States). Dept. of Chemical Engineering and Materials Science
Kazan Federal Univ. (Russia)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry

Despite the wide use of polymer nanocomposites (PNCs) in various applications, our understanding of the microscopic parameters controlling their macroscopic properties remains limited. In this study, we examine the dielectric strength of segmental dynamics, Δε_IL(T) in the interfacial polymer layer surrounding the nanoparticles in PNCs. The presented analysis reveals a significant drop in Δε_IL(T) and its anomalous temperature dependence in the polymer layer adsorbed to nanoparticles. The drop in Δε_IL(T) was observed in all samples regardless of whether segmental relaxation time in the interfacial layer was slower or faster than in the bulk polymer, excluding interpretation of the “dead” layer. We ascribe the observed decrease in the dielectric strength to the restricted amplitude of segmental relaxation in the interfacial/adsorbed layer. Our results provide a new perspective on discussion of dynamics in the interfacial layer in PNCs and thin polymer films, demonstrating that not only segmental relaxation time but also its amplitude can be strongly affected by the interface.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1631231

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 10 Vol. 53; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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