Structural and Dielectric Properties of CdS Nanoparticle Embedded Polyurethane Nanocomposite Samples

Abstract

The polymer nanocomposite samples have been prepared by solution embedding of CdS nanoparticles in polyurethane (PU). The structural properties have been studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM). SEM and AFM images represent the dispersion of CdS nanoparticles in a polymer matrix. The permittivity of nanocomposite samples increases with temperature due to formation of new dipoles or accumulation of charge carriers in a nanoparticle-polymer interface. The increase in permittivity with temperature can be attributed to the heat-assisted dipole moment. Furthermore, it has been observed that permittivity is the function of nanoparticle concentration, temperature, and frequency. The high concentration of nanoparticles lowers permittivity with frequency. The positive and negative tangential loss has been observed in PU-CdS nanocomposite samples. The

Enhanced dielectric and ferroelectric properties of surface hydroxylated Na0.5Bi0.5TiO3 (NBT)-poly(vinylidene fluoride) (PVDF) composites

“…The increase in dielectric loss at low-frequency region (from 10 2 to 10 3 Hz) may be due to the relaxation mechanism present in the polymer matrix. [35][36][37] The increase in dielectric loss with increase in h-NBT content can be explained on the basis of polarization of the sample. However, the composites with 10 and 20 wt.% of h-NBT do not follow the trend of other composite systems with the frequency region from 10 2 to 10 6 Hz with the increase of h-NBT content.…”

Preparation of the copper-based polyoxometalate/polyurethane composites and their dielectric properties

“…9,10 In these studies, additives such as graphite, graphene oxide and cadmium sulfide were used to adjust the free volume and dielectric constant of PU structure. 11 -13 For reducing the dielectric constants of polymeric structures, POMs structures as reinforcement with superior electrical properties have very high potential. 14,15…”