Rezumat
CZU 541(64+15):537.7
High-frequency dielectric (ε and tgδ) properties and relaxation α-, β-, and γ-processes in polypropylene composites with α-Al2O3 filler have been studied. It is shown that, experimental and calculated values (ε and tgδ) of the composition PP/α-Al2O3 within filler content to 20–25% and highly-filled above 30–40% composites are described using different modes. Shown that, insertion of α-Al2O3 into PP, results in significant change in the form and position of β and ά maxima. Relaxation nature of glow peaks of RTL spectra in β- and α'-relaxation fields allows to assume that, up to 40% highly-filled composites PP/α-Al2O3 can be used as γ-dosimetric material within the dose up to 50 kGr.