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Ionic poly(dimethylsiloxane)-silica nanocomposites: Dispersion and self-healing
Abstract
Poly(dimethylsiloxane) (PDMS)-based nanocomposites have attracted increasing attention due to their inherent outstanding properties. Nevertheless, the realization of high levels of dispersion of nanosilicas in PDMS represents a challenge arising from the poor compatibility between the two components. Herein, we explore the use of ionic interactions located at the interface between silica and a PDMS matrix by combining anionic sulfonate-functionalized silica and cationic ammonium-functionalized PDMS. A library of ionic PDMS nanocomposites was synthesized and characterized to highlight the impact of charge location, density, and molecular weight of ionic PDMS polymers on the dispersion of nanosilicas and the resulting mechanical reinforcement. The use of reversible ionic interactions at the interface of nanoparticles–polymer matrix enables the healing of scratches applied to the surface of the nanocomposites. Molecular dynamics simulations were used to estimate the survival probability of ionic cross-links between nanoparticles and the polymer matrix, revealing a dependence on polymer charge density. Show more
Publication status
publishedExternal links
Journal / series
MRS BulletinPublisher
SpringerSubject
Composite; Interface; Nanoscale; Inorganic and simulationOrganisational unit
03359 - Oettinger, Christian (emeritus) / Oettinger, Christian (emeritus)
Funding
185052 - VISIONNANO - Viscoelastic properties, entanglements, and polymer dynamics in ionic nanocomposites (SNF)
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