Abstract : The reinforcement of elastomers by inorganic fillers, a concept of very high technological importance, is commonly understood to result from the presence of a mechanical network of partially aggregated filler particles. The non-linear mechanical properties, in particular the decrease of the modulus at high strain (Payne effect), are further interpreted to be a consequence of the breakdown of this filler network. There are, however, many open questions concerning the actual nature of the interparticle connections, where a modified polymer layer forming ‘‘glassy bridges’’ constitutes one possibility. In this work, we address this issue with a suitable silica-filled model elastomer, where we characterize the silica dispersion by SANS in combination with reverse Monte-Carlo modeling, and the mobility modification of the polymer by low-field proton NMR spectroscopy. In our samples, we identify a glassy layer as well as a region of intermediate mobility (possibly modified Rouse modes). Based on the structural information from SANS, we are able to quantify the amount of interparticle
A été sélectionné papier "HOT TOPICS " de Soft Matter
Reference de la publication : Aurelie Papon, Helene Montes, Francois Lequeux, Julian Oberdisse, Kay Saalwachter and Laurent Guy Accepted 3rd February 2012 SOFT MATTER DOI : 10.1039/c2sm06885k
Site web de la publication : http://pubs.rsc.org/en/content/arti...