Effect of UV radiation on dielectric properties of PU/nano-TiO2 composites

Ahmed Q Abdullah

doi:10.30723/ijp.v15i33.139

Abstract

The dielectric constant of most polymers is very low; the addition of TiO2 particles into the polymers provides an attractive and promising way to reach a high dielectric constant. Polymer-based materials with a high dielectric constant show great potential for energy storage applications. Four samples were prepared, one of them was polyurethane (PU) and the other were PU with different weight percent (wt %) of TiO2 (0.1, 0.2, 0.3) powder AFM test was used to distinguish the nanoparticles. The result shows that the most shape of these nanoparticles are spherical and the roughness average is 0.798 nm. The dielectric properties were measured for all samples before and after the exposure to the UV radiation. The result illustrates that the dielectric constant decreased and the dielectric loss increased, the amount of decrease in the dielectric constant decreases with the increasing of the TiO2 concentration that added to the PU and decreasing in the amount of dielectric loss.

Highlights

Polymer composites filled with ceramic particles have received considerable attention in the past decade
AFM was performed to measure the average diameter of TiO2 nanoparticles by using AA3000 Scanning Probe Microscope by: Angstrom Advanced Inc
Dielectric constant (ԑ') and dielectric loss (ԑ'') vs. frequency for different PU–TiO2 composites are presented in Fig. 2 and Fig. 3, respectively

Summary

Introduction

Polymer composites filled with ceramic particles have received considerable attention in the past decade. Polyurethane is a polar polymer having relatively high permittivity, so it used as a capacitor for electronic applications. A tailor-made capacitor with controlled dielectric properties can be obtained using PU as a matrix filled with electro-ceramics, such as titania (TiO2) having a high dielectric constant [6]. Experimental The cast technique was used to prepare three sample of polyurethane one of them was pure and the other were polyurethane with additives three volume fractions of TiO2 nanoparticales (0.1, 0.2 and 0.3). Dielectric properties of these composites were measured using a precision LCR meter (Agilent impedance analyzer American origin). Measurements were performed before and after irradiation by UV Source

Results and discussion

PU pure

Conclusions