The addition of nano/micro silica into unsaturated polyester resin (UPR) results in the improvement of the electricalproperties of Silica-UPR composites. The surface, volume resistivity, dielectric strength, dissipation factor and dry arcresistivity of nano silica-UPR composites were found to improve significantly. The effects of the nano and micro fillersin UPR have been evaluated. They are presented in this paper. To evaluate the electrical properties of the nano µ composites, all the measurements were done as per the prescribed methods in ASTM. It was observed that theaddition of nano silica improves the electrical properties as compared to micro silica. The better dispersion of silicaparticles in unsaturated polyester resin enhances the electrical properties of silica-UPR composites

The present approach shows the use of nano-silica / nano-alumina in polyurethane (PU) matrix, which lead to significant improvements in the mechanical and thermal properties of the nano-composite. It is observed that with incorporation of 1% of nano-alumina into the PU matrix, there is an improvement in the tensile strength of around 50%, and for nano-silica the improvement is around 41%, at the same concentration. The morphological data shows that above 3% of the nano particles there are agglomerations in the nanocomposite. Again with the absorption of moisture, there is a decrease in the thermal and mechanical properties of the PU resin, but in this research work it is observed that with the incorporation of the nano particles, in the presence of absorbed moisture there is an improvement in mechanical and thermal properties of the composite, over that of the PU matrix.

Considering the properties of the carbon nano tubes (CNT), their inclusion into the polymer matrix vastly increasesthe properties of the resultant composite. However, this is not the case due to the poor interfacial adhesion of the CNTand the polymer matrix. The present approach focuses on increasing the interaction between the polymer matrix andthe CNT through the chemical modification of the CNT resulting in allyl ester functionalized carbon nanotubes (ACNT)and silane functionalized carbon nano tubes (SCNT) which are capable of reacting with the polymer matrix duringthe curing reaction. The addition of ACNT/SCNT into unsaturated polyester resin (UPR) resulted in the improvementof the electrical properties of resulted nanocomposites in comparison to the CNT. The surface resistivity, volumeresistivity, dielectric strength, dry arc resistivity, and the comparative tracking index of the nanocomposites weresignificantly improved in comparison to CNT. The chemical modification of CNT was confirmed via spectroscopy

Graphene-based polymer nanocomposites are very promising candidates for new high-performance materials thatoffer improved mechanical, barrier, thermal and electrical properties. Herein, an approach is presented to improvethe mechanical, thermal and electrical properties of unsaturated polyester resin (UPR) by using graphene nano sheets(GNS).The extent of dispersion of GNS into the polymer matrix was also observed by using the scanning electronmicroscopy (SEM) which indicated homogeneous dispersion of GNS through the UPR matrix and strong interfacialadhesion between the GNS and UPR matrix were achieved in the UPR composite, which enhanced the mechanicalproperties. The tensile strength of the nanocomposites improved at a tune of 52% at a GNS concentration of 0.05%.Again the flexural strength also increased around 92% at a GNS concentration of 0.05%. Similarly the thermalproperties and the electrical properties for the nanocomposites were also improved as evidenced from the differentialscanning caloriemetry (DSC) and dielectric strength measurement

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