A high-temperature dielectric process as a probe of large-scale silica filler structure in simplified industrial nanocomposites - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2015

A high-temperature dielectric process as a probe of large-scale silica filler structure in simplified industrial nanocomposites

Résumé

The existence of two independent filler-dependent high-temperature Maxwell–Wagner–Sillars (MWS) dielectric processes is demonstrated and characterized in detail in silica-filled styrene–butadiene (SB) industrial nanocomposites of simplified composition using Broadband Dielectric Spectroscopy (BDS). The uncrosslinked samples are made with 140 kg/mol SB-chains, half of which carry a single graftable end-function (50% D3), and Zeosil 1165 MP silica incorporated by solid-phase mixing. While one high-temperature process is known to exist in other systems, the dielectric properties of a new silica-related process – strength, relaxation time, and activation energy – have been evidenced and described as a function of silica volume fraction and temperature. In particular, it is shown that its strength follows a percolation behavior as observed with the ionic conductivity and rheology. Moreover, activation energies show the role of polymer layers separating aggregates even when they are percolated. Apart from simultaneous characterization over a broad frequency range up to local polymer and silanol dynamics, it is believed that such high-temperature BDS-measurements can thus be used to detect reorganizations in structurally-complex silica nanocomposites. Moreover, they should contribute to a better identification of dynamical processes via the described sensitivity to structure in such systems.
Fichier principal
Vignette du fichier
Baeza_PCCP_rev.pdf (238.73 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01110040 , version 1 (27-01-2015)

Identifiants

Citer

Guilhem Baeza, Julian Oberdisse, Angel Alegria, Marc Couty, Anne-Caroline Genix. A high-temperature dielectric process as a probe of large-scale silica filler structure in simplified industrial nanocomposites. Physical Chemistry Chemical Physics, 2015, 17, pp.1660-1666. ⟨10.1039/c4cp04597a⟩. ⟨hal-01110040⟩
102 Consultations
237 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More