Abstract: “The backbone of Natural rubber (NR), polyisoprene, is derived from the polyacetylene backbone through the saturation of every other double bond. Polyisoprene is a potential candidate for materials used in various devices: solar cells, LEDs, and FETs. It is also used in electrically energized line services as electrical energy utilities without any energy breakdown. Therefore, analysis of dielectric property becomes inevitable since they determine the end electrical applications, per se, insulation. Present work is aimed at the determination of dielectric constant of natural rubber by using the method proposed by Robert and Von-Hippel. The effect of microwave frequency, namely 9.6 GHz and 26 GHz, as well as chemical modification brought about by vulcanization and reinforcement on dielectric constant values was probed. Impedance spectroscopy can be used to monitor the progress of reactions in polymer forming systems for in-situ real time process control. Dielectric constant and dielectri”

Keywords: natural, rubber , uncured