Present research work deals with the optical study of Zinc Oxide (ZnO) dispersed Polycarbonate/Polymethylmethacrylate (PC/PMMA) blend nanocomposites. ZnO nanoparticles have been prepared by simple chemical route and their average size has been confirmed by Transmission Electron Microscopy (TEM). The average particle size of the nanoparticles has been found to be ~11 nm. Formation of PC/PMMA blend nanocomposites has been confirmed by means of X-ray Diffraction (XRD). Absorption spectra, recorded using UV-Visible spectrophotometer, have been used to determine optical constants such as band gap, extinction coefficient, refractive index and real & imaginary part of dielectric constant. It has been found that band gap decreases as ZnO wt% increases in the blend nanocomposites. Lowest band gap has been found for PC25%/PMMA75% with ZnO 3 wt% blend nanocomposite. Increase in refractive index has also been found with increasing ZnO content. These types of blend nanocomposites have applications in UV-shielding and wave guide technologies.

The present work reports the non-isothermal crystallization kinetics of PET-TiO 2 nanocomposites. The average particle size of TiO 2 nanoparticles, prepared by chemical route, has been calculated 32 nm using Debay-Scherrer's formula in XRD peaks. PET-TiO 2 nanocomposites have been synthesized using solution casting method. The investigation of non-isothermal crystallization behavior has been conducted by means of Differential Scanning Calorimeter (DSC). The crystallization temperature shift to lower temperature for both PET pristine and PET-TiO 2 nanocomposites due to decrease in mobility of chain segments and heterogeneous nucleation. Also, the inclusion of TiO 2 nanoparticles may accelerate nucleation rate in nanocomposites that causes the crystallization time and absolute crystallinity fraction. The thermal conductivity of inorganic filler TiO 2 nanoparticles may affect the crystallization temperature.

Summary:The presented work deals with the synthesis and thermal characterization of TiO 2 filled Polycarbonate/Polystyrene (PC/PS) blend nanocomposites. Nanoparticles of Titanium-dioxide have been synthesized by simple chemical method. Average grain size of as prepared nanoparticles have been determined by both TEM and XRD. Titanium-dioxide Filled Polycarbonate/Polystyrene blend nanocomposites have been prepared by solution casting method. The XRD pattern and FTIR spectrum confirm the formation of blend nanocomposites. Differential Scanning Calorimetry (DSC) has been used to study thermal properties. The DSC thermograms indicate that the glass transition temperature and hence thermal stability of nanocomposites enhances with addition of filler content.

The structural and chemical properties with non-isothermal crystallization kinetics of PET-ZnO nanocomposites have been reported in this article. ZnO nanoparticles have been synthesized via chemical route with average diameter 19 nm which made confirm by transmission electron microscopy and X-ray diffractometer (XRD) techniques. PET-ZnO nanocomposites have been prepared by solution casting method. The structural and chemical changes occurred in poly (ethylene terephthalate) after inclusion of ZnO nanoparticles have been studied with the help of XRD and Fourier transform infrared spectroscopy, respectively. It was observed from differential scanning calorimeter that ZnO nanoparticles work as nucleating agent for heterogeneous nucleation in PET matrix under non-isothermal crystallization process. The combined Avrami and Ozawa models have been proved adequate to explain non-isothermal crystallization kinetics of PET-ZnO nanocomposites, and also, ZnO nanoparticles have been caused to reduce crystallization activation energy in pristine PET as per the applied Kissinger model.

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