Investigation on dielectric properties of PDMS based nanocomposites

Shivashankar, H and Kevin, A M and Manohar, S B S and Kulkarni, S M (2021) Investigation on dielectric properties of PDMS based nanocomposites. Physica B :Physics of Condensed Matter, 602. ISSN 0921-4526

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Abstract

Polymer nanocomposites have recently been used in applications for energy storage, sensors, and actuators. The polymer materials are gaining dielectric properties such as dielectric permittivity, electrical modulus, and conductivity. In the present study, nanocomposite material is prepared by a solution cast method incorporating carbon black particles into polydimethylsiloxane. The dielectric properties of PDMS/CB nanocomposites are investigated over broad frequency using an impedance analyzer. The polymer nanocomposite’s dielectric permittivity is evaluated using the various empirical models available in the literature. Compared with other methods the Wiener model is very similar to the experimental findings. For the frequency range of 100 Hz-100kHz, the frequency-dependent and independent dielectric response was observed. Nanocomposite dielectric permittivity is improved marginally with the reinforcement of carbon black particles. The nanocomposite dielectric loss moves to the higher frequency, although the losses are small. It is proved that electrical modulus can reduce the effect of polarization of electrodes. Nanocomposite AC conduc�tivity exhibits strong frequency dependence particularly in the higher frequency region of the vicinity. This behavior obeys the power law at critical frequency, which reveals the process of relaxing conductivity. The PDMS/CB nanocomposites power-law exponent is within a range of 0.48–0.57. Eventually, empirical and experimental inspections are the basis framework for designing electronic devices based on polymers.

Item Type: Article
Uncontrolled Keywords: Nanocomposites Dielectric properties Numerical models Electric conductivity Dielectric relaxation
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Engineering > MIT Manipal > Mechatronics
Depositing User: MIT Library
Date Deposited: 06 Sep 2021 08:58
Last Modified: 06 Sep 2021 08:58
URI: http://eprints.manipal.edu/id/eprint/157339

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