Effect of temperature on the electrical properties of epoxidized natural rubber based nanocomposites for electrical insulation

Suhaimi, Nur Nabillah Aula (2021) Effect of temperature on the electrical properties of epoxidized natural rubber based nanocomposites for electrical insulation. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

An electrical cable is a component of transmission lines that provide consumers with protection and convenience. The electrical cable can be made up of natural rubber composites. However, natural rubber has limited electrical properties and heat resistance. This limitation can be overcome by incorporating alumina nanoparticles into an epoxidized natural rubber (ENR) composite. Alumina nanoparticles were chosen due to their high electrical resistivity and excellent thermal properties. Therefore, this study evaluates the effect of temperature ageing on the electrical and mechanical properties of ENR filled with alumina nanocomposite (ENRAN). ENRAN composites with alumina nanoparticle loadings of 5 wt% were prepared using melt compounding and hot-pressing processes. Next, ENRAN composites were thermally aged in 5 different temperatures, room temperature, 40 °C, 60 °C, 90 °C, and 120 °C for 8 hours. The electrical properties were tested using surface resistivity, volume resistivity and electrical conductivity. Meanwhile, the mechanical properties (tensile strength) were postulated through a critical review of closely related previous research papers. The experimental result and postulated result of ENRAN composites were further supported by the structural and morphological properties of the material by using FTIR, XRD, and SEM analyses data. The different ageing temperatures have proven to affect ENRAN's electrical and mechanical properties. Surface and volume resistivity of ENRAN composites decreased with increasing temperature, but volume electrical conductivity increased. Tensile strength is postulated to decrease as ageing temperature increases. The lowest reading of surface and volume resistivity are recorded at 90°C. The surface and volume resistivities at 120°C are ineffective due to the filler's agglomeration. ENRAN composites can withstand temperatures of up to 90 °C for 8 hours before losing their electrical properties and becoming less insulative. At 90°C, ENRAN composite remains an insulator because its surface and volume resistivity values remain within the range of good insulators (E+l 2-E+20 n.cm). The findings will benefit the electrical industries in the development of green materials for electrical insulation.

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