Electrical properties of polyetherimide thin films: Non-parametric dielectric response analysis with distribution of relaxation times

Abstract

High temperature polymeric materials for electrical insulation and energy storage are needed for transformational power applications such as pulsed-power and hybrid electrical vehicles. One of the candidate materials has been polyetherimide, an amorphous thermoplastic with a glass transition over 200 C. Here, the dielectric studies on the material are reported by taking into account the polarization and conduction processes in the polyetherimide. The dielectric data were analyzed with the distribution of relaxation times approach with Debye expression as the kernel in the inversion algorithm, the results then created the relaxation map for polyetherimide. The method satisfies the Kramers-Kronig relationships, so the ohmic conductivity and permittivity at high frequencies could be estimated from the experimental data even if there exists significant measurement error. The data were compared to the published results on polyetherimide in the literature. The materials is a low loss polymer with negligible ohmic losses below 200C. The estimated fragility of the polyetherimide was high about 284 from the resolved relaxation map using the Vogel-Fulcher-Tammann-Hesse expression. Polyetherimide is a good dielectric for advanced energy storage and electrical insulation technologies up to 200 C.

Research Progress of All Organic Polymer Dielectrics for Energy Storage from the Classification of Organic Structures

“…[ 108 ] More recently, Tuncer et al. [ 114 ] investigated the non‐parametric dielectric response of the PEI via a numerical inversion algorithm to solve the relaxation time distribution of the PEI films with a thickness of 5 µm. They revealed that the PEI is the potential for passive electrical component applications.…”

Electrospun Copoly(ether imide) Nanofibers Doped with Silver-Loaded Zeolite as Materials for Biomedical Applications

“…These polymers exhibit good chemical resistance, excellent electrical insulating properties, and high tensile strength over a wide temperature range. 7 show biocompatibility and low cytotoxicity which allow their use in bioapplication fields. 8,9 The characteristics of polyimides can be improved by using suitable monomers and the preparation of segmented copolymers containing flexible and rigid alternating segments.…”

“…In this case, the imide cycles impart good thermal stability, while the ether groups improve the solubility and reduce the glass transition and the softening temperatures of the polymers. These polymers exhibit good chemical resistance, excellent electrical insulating properties, and high tensile strength over a wide temperature range . They show biocompatibility and low cytotoxicity which allow their use in bioapplication fields. , …”

The Deep-Prior Distribution of Relaxation Times

“…One alternative to these conventional methodologies is to use the distribution of relaxation times (DRT) [25][26][27][28][29][30][31][32], which interprets the impedance as resulting from a distribution of relaxation timescales, i.e., (1) where is the impedance, is the frequency, is the DRT, is a timescale variable, is a resistance, and is an inductance. The DRT model has proven to be very powerful, and recently this method has been employed to understand the fundamentals of solidstate ionic systems [33,34], batteries [35][36][37][38], supercapacitors [39,40], porous electrochemical reactors [41], dielectrics [42], solar cells [43], and fuel cells [44][45][46][47]. These applications have highlighted the promise of DRT models.…”