Polystyrene-glass bead composites: Maxwell-Wagner-sillars relaxations and percolation

Cellulose Nanofibril Film as a Piezoelectric Sensor Material

“…At the same time, dielectric losses increased rapidly from 10 kHz onward accompanied by steeper declining of relative permittivity, which is typical indication of a relaxation mechanism taking place (Figure ). However, the change of relative permittivity was quite small, around 7% from 100 Hz to 1 MHz, and it was at a similar level as that obtained at ∼10 GHz, suggesting that only minor level of dielectric relaxation phenomena is occurring due to Maxwell–Wagner–Sillars (MWS) type of the polarization . Such polarization takes place typically at acoustic frequencies and is associated with, for example, immobilized free charges on the interfaces of different media having contrast in conductivity and permittivity.…”

Crystallinity and dielectric relaxations in semi-crystalline poly(ether ether ketone)

“…The effect of the diameter, the volume fraction and the surface coating of glass beads on the interfacial relaxation characteristics have been studied [34][35][36]. A very good agreement was found between experiments and calculations embedded in an insulating matrix [37].…”

A printable P(VDF-TrFE)-PZT Composite with Very High Piezoelectric Coefficient

“…The decrease in permittivity was partly due to the smaller amount (50 vol.% vs. 48 vol.%) of ceramic particles in the composite (permittivity difference 8-10 % using the commonly used Bruggemans model [16,18]). Also, the surfactant has a low permittivity whereas P(VDF-TrFE) is known to be a polymer with very high permittivity (Table 1), and about 2.5 vol.% of the P(VDF-TrFE) was replaced with surfactant in the present composition (compared to 48 vol.% composite without surface treatment) [12,35]. These two effects are evident from the compositional differences between the two composites.…”