Effect of selenium oxide nanofiller on the structural, thermal and dielectric properties of CMC/PVP nanocomposites

Abstract

This system reports about synthetic carboxymethyl cellulose (CMC)/polyvinylpyrrolidone (PVP) containing selenium nanoparticles (SeO2), as novel nanocomposite films using solution casting technique. The structure of the films was analyzed using X-ray diffraction and Fourier transform infrared spectroscopy (FT-IR), which confirm the interaction between CMC/PVP blend and SeO2. The differential thermal analysis (DTA) was measured in the temperature range from 25 to 700 °C. All curves of DTA show an endothermic peak at 62 °C attributed to the glass transition (Tg) temperature. The main peak observed at 212 °C was assigned to the melting transition temperature (Tm) of the blend. After the addition of SeO2, the peaks varied in their height, area under the peak and the position of temperature as an important factor in lignin thermal decomposition. The shifts of DTA and DTG curves results towards the lower temperature indicate that with the addition of Se occurs an increase in the thermal stability with increasing of SeO2 nanoparticles content. The dielectric studies indicate that a decrease in dielectric constant value (ε') were founded at higher frequencies for all the films. The maximum values of both ε' and ε'' were founded at the lower frequency and they decreased when the frequency was increased.