%0 Journal Article
%T How Tuning Interfaces Impacts the Dynamics and Structure of Polymer Nanocomposites Simultaneously
%+ Laboratoire Charles Coulomb (L2C)
%+ Laboratoire Charles Coulomb (L2C)
%A Genix, Anne-Caroline
%A Bocharova, Vera
%A Carroll, Bobby
%A Dieudonné-George, Philippe
%A Chauveau, Edouard
%A Sokolov, Alexei
%A Oberdisse, Julian
%< avec comité de lecture
%@ 1944-8244
%J ACS Applied Materials & Interfaces
%I Washington, D.C. : American Chemical Society
%V 15
%N 5
%P 7496-7510
%8 2023-02-08
%D 2023
%Z 2310.14680
%R 10.1021/acsami.2c18083
%K Surface modification
%K interfacial gradient
%K interparticle spacing distribution
%K segmental dynamics
%K interfacial layer thickness
%K colloidal silica
%K silane
%K poly(2-vinylpyridine)
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Journal articles
%X Fundamental understanding of macroscopic properties of polymer nanocomposites (PNCs) remains difficult due to the complex interplay of microscopic dynamics and structure, namely interfacial layer relaxations and three-dimensional nanoparticle arrangements. The effect of surface modification by alkyl methoxysilanes at different grafting densities has been studied in PNCs made of poly(2-vinylpyridine) and spherical 20 nm silica nanoparticles (NPs). The segmental dynamics has been probed by broadband dielectric spectroscopy, and the filler structure by small-angle X-ray scattering and reverse Monte Carlo simulations. By combining the particle configurations with the interfacial layer properties, it is shown how surface modification tunes the attractive polymer-particle interactions: bare NPs slow down the polymer interfacial layer dynamics over a thickness of ca. 5 nm, while grafting screens these interactions. Our analysis of interparticle spacing and segmental dynamics provides unprecedented insight into the effect of surface modification on the main characteristics of PNCs: particle interactions and polymer interfacial layers.
%G English
%2 https://cnrs.hal.science/hal-04244949/document
%2 https://cnrs.hal.science/hal-04244949/file/Hydrophobic_manuscipt_C18.pdf
%L hal-04244949
%U https://cnrs.hal.science/hal-04244949
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021
%~ UM-EPE