Liquid silicone rubber composites were developed using two types of clays as filler materials; organically modified montmorillonite (ommt) and calcined, surface treated kaolin with the commercial name Translink 37 (T37). Addition of the clays into silicone rubber matrix resulted in well dispersed clay particles in the silicone rubber matrix when kaolin (T37) was added as compared to micron size agglomeration with ommt clay. The surface chemistry of the fillers played a significant role on curing kinetics and as a result had significant effect on electrical properties of composites. The negative surface charge on the modified kaolin had detrimental effect on the catalytic activity of platinum complex in the liquid silicone rubber and this led to incomplete crosslinking in the composite and caused higher dielectric loss and dc conductivity. On the other hand, organically modified montmorillonite (ommt) was more difficult to disperse in the silicone rubber matrix. However, the dc conductivity of the composite was relatively lower than the neat silicone rubber at high temperature indicating presence of interfacial traps between agglomerated macroparticles and matrix which limited the migration of the charge carriers over long distances. SR - ommt composites were also able to withstand higher electric fields as compared to silicone rubber- kaolin (T37) composites.<br/>

Impact of modified clays on high filed electrical properties of silicone rubber

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.