Research Information System
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES, vol.34, no.6, pp.566-579, 2026 (SCI-Expanded, Scopus)
beta-SiC nanostructures were synthesized and incorporated into polypropylene (PP) to obtain SiC/PP nanocomposites (1-10 wt%). Scanning Electron Microscopy (SEM) revealed mixed morphologies of SiC with relatively uniform distribution, but progressive agglomeration at higher loadings. Debye-Scherrer calculations indicated that the SiC crystallite size in the composites evolves non-monotonically from 2.01 to 51.32 nm as a function of filler concentration, reflecting a competition between heterogeneous nucleation, particle aggregation, and interfacial confinement. Ultraviolet-Visible (UV-Vis) spectroscopy demonstrated deep-UV absorption below similar to 230 nm and slight shifts of the direct band gap, with Eg varying in a narrow range between 5.82 and 5.98 eV across the SiC/PP nanocomposite materials (Eg(PP) = 5.88 eV, Eg(SiC) = 5.79 eV). Fourier Transform Infrared (FTIR) and Raman spectroscopy revealed the gradual reduction of PP-characteristic bands and the growth of Si-C vibrational signatures, accompanied by an increase in the PP beta-phase fraction, indicating effective interfacial interactions and beta-nucleation by beta-SiC. Dielectric spectroscopy revealed Maxwell-Wagner-Sillars relaxation and a loading-dependent decrease of the permittivity at 80 degrees C and log omega approximate to 5.75 from epsilon ' approximate to 8.12 (PP) to approximate to 5.3-4.9 for composites. similar to 3 wt% SiC/PP provides an optimal compromise between dispersion, crystallinity, optical, and dielectric properties, making these nanocomposites promising for deep-UV-active insulating films and lightweight dielectric components.