The present research work was aimed at improving the high field dielectric properties of silicone rubber (SR) composites used for power cable insulation. 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). The results revealed that the surface chemistry of the clay had a distinct effect on both dispersion as well as electrical performance of silicone rubber-clay composites. We observed that surface treated kaolin (T37) were well dispersed in the SR matrix, but had adverse impact on the crosslinking kinetics of liquid silicone rubber resulting in higher dielectric loss at low frequencies. On the other hand, organically modified clay showed poor dispersion in the silicone rubber matrix while exhibiting much lower dc conductivity characteristics at high temperature. The agglomerated ommt macroparticles introduced the interfacial traps in SR matrix and charge carriers migration was limited within the matrix.

当前的研究工作旨在改善用于电力电缆绝缘的硅橡胶（SR）复合材料的高场介电性能。使用两种类型的粘土作为填充材料开发了液态硅橡胶复合材料。经过有机改性的蒙脱土（ommt）和经煅烧，表面处理的高岭土，商品名为Translink 37（T37）。结果表明，粘土的表面化学性质对硅橡胶-粘土复合材料的分散性和电性能均具有显着影响。我们观察到，经表面处理的高岭土（T37）很好地分散在SR基质中，但对液态硅橡胶的交联动力学有不利影响，从而导致低频下的介电损耗更高。另一方面，有机改性的粘土在硅橡胶基质中的分散性较差，而在高温下的直流电导率特性要低得多。附聚的ommt大颗粒在SR基质中引入了界面陷阱，并且载流子在基质内的迁移受到限制。