Dielectric response of PVC polymer loaded with Ba_0.3Na_0.7Ti_0.3Nb_0.7O₃ceramic powder

Abstract

Dielectric response of poly(vinyl chloride), (PVC), loaded with different amount of Ba 0.3 Na 0.7 Ti 0.3 Nb 0.7 O 3 (BNTN) ceramic powders was investigated in frequency range 100 Hz-1 MHz and temperature range 100-450 K. Ceramic solid solution of barium titanate and sodium niobate with composition Ba 0.3 Na 0.7 Ti 0.3 Nb 0.7 O 3 was obtained from BaCO 3 , TiO 2 , Na 2 CO 3 and Nb 2 O 5 by conventional method. Powders were prepared by grinding of ceramics. The obtained ceramics, used to produce BNTN-PVC composites, are characterized by the relaxor behaviour with a broad peak of dielectric permittivity " 0 at T m % 230 K. The microstructure of the powders was observed and the grain size was estimated using scanning electron microscope Hitachi S-4700. The EDS analysis confirms the qualitative and quantitative chemical composition of powders and ceramics. The BNTN-PVC composite samples of 0-3 connectivity were prepared from ceramic and polymer powders by hot-pressing method. The dielectric response of the composites displays features originated from the PVC polymer modified by those of BNTN ceramics. The relaxation time of the -process of PVC obeys the Vogel-Fulcher law and decreases with increasing volume fraction of the ceramics.

Dielectric properties of polyethylene terephthalate/polyphenylene sulfide/barium titanate nanocomposite for application in electronic industry

“…The effect is in accordance with numerous theoretical models valid for spatially fixed particles, embedded in a matrix with lower permittivity [19–21]. This behavior is very similar to that observed for other composites made from ceramics and polymers such as SBN70‐PVC [22], PZT‐PVDF [23], PLZT‐P(VDF/TFE) [24] and BNTN‐PVC [25], for example, PPS shows a weak dependence of ε′ on the frequency, contrary to PET and the composites. This fact results from the presence of polar groups in PET and composites consequently.…”

Engineering of Polystyrene/BiFeO3 0–3 Thin Film Nanocomposites for Mechanical Energy Harvesting

“…[10,14] The second strategy is the introduction of the active (piezoelectric) phase into a non-conductive polymer matrix, where ferroelectric particles change the resistivity of all composites. Among non-conductive polymers, the literature mainly reports polypropylene, [15] polystyrene, [16] polyimides, [17] poly(vinyl chloride), [18] epoxy resins, [7,[19][20][21] and poly(dimethylsiloxane). [22] They can be divided into two different groups -solid polymers and resins.…”