High-temperature energy storage performances of “isomer-like” polyimide and its thermoplastic polyurethane blending system

Abstract

With the rapid development of high-temperature energy storage devices, polyimide films with excellent thermal stability have become candidates for capacitor materials. However, the energy density (Ue) and efficiency (η) of...

Improved energy storage properties of polypropylene-based composite dielectrics by introducing surface-charged BaTiO3@chitisan ultrafine constructions

“…Consequently, the structural and dielectric stability of the composite dielectrics at high temperatures is of great importance. 15,49 The temperature-dependent dielectric behavior of the BaTiO 3 @CS/PP composites at 100 Hz is presented in Fig. 4d, where both ε r and tan δ over a wide temperature range of 25–105 °C are found to exhibit a tendency similar to those at room temperature.…”

“…It is possibly due to that at high temperature, the macromolecular chains of PP could gain sufficient energy to move, which improves the polarization and thus enhances ε r of PP. 49 Moreover, the tan δ of the composites is kept stable at a low level as the temperature changes, which helps to endow the composite dielectrics with both high E b and η values in a wide temperature range.…”

“…Thus, the conductivity of PP and the BaTiO 3 @CS/PP composite rises significantly, especially after 105 1C. 49 Moreover, at all three testing temperatures, the E b values of the BaTiO 3 @CS/PP composites are always significantly greater than those of PP. In particular, as shown in Fig.…”

Versatile Landscape of Low-k Polyimide: Theories, Synthesis, Synergistic Properties, and Industrial Integration

“…PI as a “golden material” has been proven to be the most common engineering plastic used in electronic/electrical systems and has attracted much attention as shown in Figure c,d. − Generally, there are two kinds of design approaches for the low- k PI: − (1) Reduce the polarizability of materials. The permittivity of materials is intimately associated with the molar polarization and molar volume of dipoles. , So, the reduction of the permittivity is mainly concerned with the concentration and position of polar groups as well as other structural factors in a molecule.…”