Dielectric impedance studies of poly(vinyl butyral)-cenosphere composite films

Abstract

In the current study, amino silane functionalized cenosphere particles was used as a reinforcing filler in poly(vinyl butyral) matrix and were made by melt blending. The changes observed in the dielectric performance of the composite films with varying weight percentage of cenosphere particle in the matrix were investigated. The dielectric property and impedance spectroscopy were evaluated as a function of applied frequency in the range of 50 Hz to 5 MHz. It is observed that, because of orientation polarization of the PVB polymer, the permittivity and impedance decrease, whereas conductivity increases. Tangent loss graph indicates that the property of the matrix is associated with geometrical fill factor and the lowest quality factor. Therefore, above 10 kHz, these composites can be considered as dielectric loss-less material. POLYM. COMPOS., 35:1636-1643, 2014

Effect of Cenosphere Fly Ash on the Thermal, Mechanical, and Morphological Properties of Rigid PVC Foam Composites

“…Manjunath et al [15] reported that the glass transition temperature (Tg), activation energy for decomposition, and Smoke Density Rating (SDR) of PVC/cenosphere composites decrease with increasing the cenosphere content without affecting their Limiting Oxygen Index (LOI) and thermal stability. Roy et al [16] added amino silane functionalized cenospheres to poly(vinyl butyral) using melt mixing method; they reported that the dielectric properties of the composite films is dependent on the cenosphere content.…”

Complex Impedance Study of Graphite Nanopowder (GNP) Reinforced Polyvinyl Alcohol (PVA)‐Bismuth Ferrite (BiFeO3) Composite Films

“…The value of the impedance decrease with frequency may be attributed to the dielectric dispersion polarization. [ 30,31 ] Moreover, the increase in conduction with frequency is shown by a smaller Z ' value at higher frequencies and a larger Z ' value at lower frequencies. The frequency response of Z ″ at room temperature is shown in Figure 1b.…”

Microwave absorption efficiency of poly (vinyl-butyral)/Ultra-thin nickel coated fly ash cenosphere composite

“…These attractive properties of FAC make it an ideal candidate for making light weight and functional composites [20,25]. Literature shows that FAC containing PVB is useful for dielectrics and device encapsulation (especially organic electronics) application [26,27]. However, FAC being inert, conducting/magnetic coating is often employed to produce core-shell type composites [28][29][30].…”