Comparison of Dielectric Properties of Polydimethylsiloxane (PDMS) Grafted Polyacrylates/Nano Alumina and Nano Silica Composites

摘要

Polydimethylsiloxane possess very poor mechanical properties. However, typically the initial modulus and durability of material is low and to improve this aspect a reinforcement phase is required. For the composite to be effective the filler must be with large aspect ratio i.e. with large surface area to volume ratio. Nano alumina (Al_2O_3) and nano silica (SiO_2) are materials of choice for nanocomposite design. Grafted Polydimethylsiloxane (G- PDMS) and nano alumina and nano Silica composites have been prepared, by solvent casting method. FTTR study reveals that there is bonding overlap in G-PDMS/SiO2 nano composites. In dielectric study, it is observed that G-PDMS/SiO2 nano composites were more conducting in nature than G-PDMS/Al_2O_3 nano composites. G-PDMS/Al_2O_3 nano composites showed enhanced dielectric constant and less loss of energy than G-PDMS/SiO_2 nano composites.