%0 Conference Paper
%F Oral 
%T Combined study of structure and dynamics in simplified industrial nanocomposites silica/SBR
%+ Matière Molle
%+ Physique des Verres
%+ Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] (CSIC)
%+ Centre de Technologie de Ladoux
%A Baeza, Guilhem
%A Genix, Anne-Caroline
%A Alegria, Angel
%A Couty, Marc
%A Oberdisse, Julian
%< avec comité de lecture
%Z L2C:13-115
%B Annual ESMI/Softcomp meeting 2013
%C Rimini, France
%8 2013-05-27
%D 2013
%K silica SBR nanocomposites tire dielectric structure
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Conference papers
%X Since 1992 and the apparition of highly dispersible silica as a nanofiller in the green-tire formulation, the structure and dynamics of precipitated silica-SBR nanocomposites produced by solid phase mixing is of a great interest for manufacturers. In this work, we make use of SAXS and TEM to investigate the organization of silica nanoparticles (Rsi 10nm) varying the filler fraction while dynamics is studied by broadband dielectric spectroscopy (BDS) and rheology. The structural analysis of such complex materials revealed a multi-scale filler organization based on a 3D fractal network built up from aggregates made of nanoparticles [1]. The characteristics (size, average aggregation number, compacity...) of such aggregates are extracted from a combined analysis of SAXS and TEM data taking into account the aggregate polydispersity (Nagg50, 35%). Jointly with mechanical experiments, this analysis enables us to estimate the critical aggregation volume fraction at which the network fully percolates (Figure 1a). In the same context, the ionic conductivity () measured by BDS at high temperature displays a jump from 12.7% of silica that we associate with the percolation threshold observed in rheology (Figure 1b). Moreover, at lower temperatures, a Maxwell-Wagner-Sillars process related to the charges blocked at the interface between silica and polymer is observed at temperatures higher than the glass transition in the nanocomposites.
%G English
%Z Michelin CIFRE
%L hal-00822935
%U https://hal.science/hal-00822935
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021
%~ TEST3-HALCNRS