Preparation and Preliminary Dielectric Characterization of Structured C60-Thiol-Ene Polymer Nanocomposites Assembled Using the Thiol-Ene Click Reaction

Abstract

Fullerene-containing materials have the ability to store and release electrical energy. Therefore, fullerenes may ultimately find use in high-voltage equipment devices or as super capacitors for high electric energy storage due to this ease of manipulating their excellent dielectric properties and their high volume resistivity. A series of structured fullerene (C60) polymer nanocomposites were assembled using the thiol-ene click reaction, between alkyl thiols and allyl functionalized C60 derivatives. The resulting high-density C60-urethane-thiol-ene (C60-Thiol-Ene) networks possessed excellent mechanical properties. These novel networks were characterized using standard techniques, including infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and thermal gravimetric analysis (TGA). The dielectric spectra for the prepared samples were determined over a broad frequency range at room temperature using a broadband dielectric spectrometer and a semiconductor characterization system. The changes in thermo-mechanical and electrical properties of these novel fullerene-thiol-ene composite films were measured as a function of the C60 content, and samples characterized by high dielectric permittivity and low dielectric loss were produced. In this process, variations in chemical composition of the networks were correlated to performance characteristics.

Investigation of the physico‐mechanical properties of electrospun PVDF/cellulose (nano)fibers

“…The drop in the ε′ values at lower f (Figure ) is most probably due to Maxwell–Wagner–Sillars (MWS) interfacial polarization and electrode polarization effects, while the drop at higher f is due to the above‐illustrated β‐relaxation dispersion. One interesting feature shown in Figure is the higher values of ε′ over ε′′, supporting that these composites may prove desirable for energy storage media applications . The maximum electrical energy storage capacity ( U max = ε′ /2) require both large ε′ and high dielectric breakdown strength ( E b ) to achieve large electrical energy storage …”

“…One interesting feature shown in Figure is the higher values of ε′ over ε′′, supporting that these composites may prove desirable for energy storage media applications . The maximum electrical energy storage capacity ( U max = ε′ /2) require both large ε′ and high dielectric breakdown strength ( E b ) to achieve large electrical energy storage …”

Flexible Pressure Sensor Based on PVDF Nanocomposites Containing Reduced Graphene Oxide-Titania Hybrid Nanolayers

“…The Dielectric permittivity storage (ε′) is constant for the PVDF and one type of additive but it decreases as f increases for the PVDF/rGO-TNL sample. Decrease in ε′ with increasing f is due to an increasing inability of the time scale of the dynamics of polarization to be apprehended within increasingly shorter signal time scales, that is, decreasing 1/2 f [49]. In addition, one would expect higher contribution from the sample electrode interfacial polarization at low f , which is caused by blocking electrodes at the sample surfaces [50].…”

Effect of Different Phosphate Glass Compositions on the Process-Induced Macromolecular Dynamics of Polyamide 66

“…Broadband dielectric spectroscopy (BDS) is considered by many researchers to be one of the most useful techniques for evaluating the dynamics of polymeric materials and is widely used for that purpose [14,15]. A dielectric response results from the interaction of dipoles or polarizable elements with an applied electric field that oscillates at different frequencies (f ) at given temperatures.…”