Slow dynamics in self-organised silica rubber nanocomposites
The dynamics of filled rubbery polymers remain poorly understood, yet underpin macroscopic phenomena of energy dissipation, which accounts for 80% of C-footprint of vehicle tyres. QENS experiments on IRIS (ISIS) aided by detailed structural analysis by SANS at ILL&ISIS show that polymer chain motion is suppressed near silica nanoparticle interfaces. We have achieved this by H-labelling end-functional polymer chains which segregate to silica nanoparticle interfaces. However, the maximum time scale on IRIS (~150 ps) was too short to determine any difference in relaxation times, and our results so far are based on the immobile background fraction. By selecting 3 samples for which IRIS could show a difference in background behaviour, will offer the best possible opportunity to quantify the slowing of PBd dynamics relative to the base polymer (i) in the presence of nanoparticles and (ii) when localised near the surface of nanoparticles. This experiment requires 3 days beamtime on IN16b to conclude this part of the study.
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Richard L Thompson; CLARKE Nigel; Bernhard Frick; GARCIA SAKAI Victoria and HART James. (2016). Slow dynamics in self-organised silica rubber nanocomposites. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-443
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