Dielectric Properties of Ni&lt;sub&gt;0.2&lt;/sub&gt;Zn&lt;sub&gt;0.8&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;-Polypropylene Composites

Khoon Khoon

doi:10.3844/ajassp.2010.1226.1230

Abstract

Problem statement: In the last decade, the studies and investigation on polymer-based composites have drawn significant attention owing to improvement in their mechanical, thermal, electrical, optical and pharmaceutical properties as compared with pure polymer. Approach: Different compositions of Ni0.2Zn0.8Fe2O4 (NZF) and Polypropylene (PP) can alter the useful properties of polymer-based composites. Hence, the determination toward significant percentage of NZF added into PP can improve the dielectric properties of the composites. NZF was prepared using conventional solid-state method and composites of isotactic PP filled with NZF were fabricated. The dielectric properties of the composite were investigated using Agilent 4284A Precision LCR meter. Results: The results indicated that with increasing ratio of wt% NZF, the dielectric constant and dielectric loss of the composite increases. The composition of 30 wt% NZF gave the highest value of the dielectric constant in the frequency range of 100 Hz-10 kHz at room temperature. Conclusion: The incorporation of ceramic filler improved the dielectric constant and increase the dielectric loss of the composite correspondingly increases its potential use as an absorbing material for electromagnetic waves.

Highlights

Ferrites which have many applications at microwave frequencies are very good dielectric material
Polymer-based composites with high permittivity were proposed due to their flexibility and ability to be fabricated into various shapes (Yang et al, 2008; Khor et al, 2009; Rittidech and Khotsongkram, 2006; Gasaymeh et al, 2010)
According to the effective medium theory, a higher dielectric constant of the polymer-based composite can be obtained by adding high dielectric constant filler into the low dielectric constant polymer matrices as shown in Fig. 4 (Yang et al, 2008; Wu et al, 2007; Giordano, 2003)

Summary

Introduction

Ferrites which have many applications at microwave frequencies are very good dielectric material. Ferrites have high electrical resistivity (Mohan et al, 1999), low dielectric loss and chemical stability. Polymer-based composites with high permittivity were proposed due to their flexibility and ability to be fabricated into various shapes (Yang et al, 2008; Khor et al, 2009; Rittidech and Khotsongkram, 2006; Gasaymeh et al, 2010). PP was chosen as the matrix due to its very attractive solid-state properties such as high modulus and tensile strength, rigidity and excellent heat resistance (He et al, 2003). The development of composites combining mineral and polymer material characteristics is definitely one of the most interesting perspectives for isotactic polypropylene (Kotek et al, 2005)

Methods

Results

Conclusion