The Influence of High-Dispersed Barium Titanate, in Films With Addition of, and Based on Poly(Vinylidene) Fluoride), on Structure and Electrophysical Properties of Ones

<p>With the aim of creation of effective electret materials, the composite films, based on poly(vinylidenefluoride) (PVF), in addition with segnetoelectric of barium titanate (BaTiO₃) were obtained in concentrationrange of 0.5 – 5.0 %vol. It is established, that presence of BaTiO₃, at low content of, leads to increase ofcrystallinity degree, and, practically, have no influence on, when at content of 1.0 – 5.0 % vol. of. There arePVF’s melting temperature range becomes narrower, when at 0.5 – 1.0 % vol. of, and, this pointing on morehomogeneous crystallite formation by dimensions in. When at high content (5.0 % vol.) of BaTiO₃, there isdecrease of crystallization temperature observed (at 5 ºC), and then, there is temperature range broadening exists,and this pointing on forming of larger, but less homogeneous crystallites by dimensions in. It is determined, whenin composite films of PVF - BaTiO₃ , that surface charge is more stable at BaTiO3 content of 4.0 %vol. in, andthen, one reaches value of 10^-6 Cl/m², when at conditions of treatment with electric field and crown discharge,and, at film charge value of 500 kV/m in. There are non-linear dependence of dielectrical permittivity exists,either when at low, or very high frequencies, and this may be linked with influence of high-disperse addition onpolymer’s crystalline structure formation, and sub-surface layers of one.</p><p><strong>Key words</strong>: poly (vinylidene fluoride), barium titanate, crystallinity degree, electret, dielectric permittivity,surface charge.</p>