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Abstract
In given work, PVC + TiO2-based nanocomposites were synthesized and their structure and dielectric properties were investigated. SEM analysis of samples was performed to determine the distribution of nanoparticles in the polymer matrix. It was pointed out that the nanoparticles play the role of structure nucleation centers when they are distributed in the polymer matrix in small quantities. As the concentration of particles increases, changes in the supramolecular structure of the polymer occurs, as well as the agglomeration of nanoparticles in the matrix, which leads to an increase in their size. The Fourier transform infrared spectroscopy (FTIR) measurements for pure polymer and nanocomposites were carried out. It has been determined that, as the concentration of TiO2 nanoparticles increases, there is no change in the chemical structure of the polymer and only decreases the intensity of the maxima of the spectra. It has been shown that polymer matrix is only physically interacted with the nanoparticles and does not form any chemical bond with nanoparticles. It has also been established that the increase in the percentage of TiO2 nanoparticles in the polymer has increased the dielectric permittivity of nanocomposites and it has started to decline at a certain concentration.