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Tailoring the Dielectric and Mechanical Properties of Polybutadiene Nanocomposites by Using Designed Ladder-like Polysilsesquioxanes
journal contribution
posted on 2018-07-13, 00:00 authored by Massimiliano D’Arienzo, Sandra Diré, Veronica Masneri, Davide Rovera, Barbara Di Credico, Emanuela Callone, Simone Mascotto, Alessandro Pegoretti, Fabio Ziarelli, Roberto ScottiIn
this study, the preparation of polybutadiene/polysilsesquioxane nanocomposites
(NCs) having tunable thermomechanical and dielectric properties is
reported. This was achieved by using different amounts of a filler
consisting of a silsesquioxane with a defined ladder-like molecular
structure (LPMASQ) bearing reactive methacrylate functionalities.
In detail, solid-state nuclear magnetic resonance (NMR) investigation
revealed that an increasing amount of filler leads to a progressive
homopolymerization of LPMASQ units resulting in the generation of
domains in the composites, which induce a kind of polymer chain confinement
in proximity of the hybrid interface. The evolution of the molecular
organization of the inorganic nanobuilding blocks as a function of
their concentration has been highlighted also by small-angle X-ray
scattering (SAXS) experiments. The gradual assembly of LPMASQ units
gives rise to peculiar dielectric properties along with enhanced thermal
and mechanical stability of the final NCs, thus supplying suitable
materials for applications in high performance dielectrics. Furthermore,
these outcomes support the idea that a careful control of the molecular
architecture and organization of the silsesquioxanes in a polymer
matrix allows to simultaneously modulate two or more distinct functional
features of polymer NCs.
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