Improved Direct Current Electrical Properties of Crosslinked Polyethylene Modified with the Polar Group Compound

Abstract

To suppress space charge accumulation and improve direct current (DC) electrical properties of insulation materials, crosslinked polyethylene modified with 2-(4-benzoyl-3-hydroxyphenoxy) ethyl acrylate (XLPE/BHEA) containing polar functional groups was prepared by melt blending. The gel content, thermal elongation, tensile strength, elongation at break, elasticity modulus, differential scanning calorimetry (DSC) and X-ray photoelectron spectra (XPS) measurement results demonstrated that the BHEA could slightly enhance the crosslinking of polyethylene (PE) and affect the mechanical properties and crystallization of XLPE, and the BHEA molecule was not easy to precipitate from XLPE after the crosslinking process. XLPE modified with 3.0 phr (parts per hundreds by weight) BHEA could effectively suppress space charge accumulation, reduce DC conduction and improve DC breakdown strength of XLPE at a higher temperature. Deeper traps were introduced in XLPE/BHEA composites due to the polar functional groups in BHEA, which could raise the potential charge injection barrier and reduce the charge carrier number and mobility to suppress space charge accumulation and reduce the conduction current density.

High energy density of polyimide films employing an imidization reaction kinetics strategy at elevated temperature

“…Polar groups can form localized states in the band gap, which have strong attraction to charges and act as traps to capture and disperse carriers during transport. [45][46][47][48] The density of deep traps for ODPA-MPD lms increased rst and then lowered down with the incremental ID, showing a trend similar to the breakdown strength. Fig.…”

Organic Semiconductor–Insulator Blends for Organic Field‐Effect Transistors

“…Specifically, the polar groups in an insulating polymer chain can increase local polarizability, some of which, such as carbonyl functional groups and conjugated double bonds, would create deep traps. [73,74] In addition, the bandgap of insulators should be large enough to ensure that charge transfer takes place exclusively on OSCs. [75] This section briefly discusses how insulator properties, for example, crystalline characteristics, T g , and M w , affect the performances of blended systems.…”

Enhancing the electrical and physical nature of high-voltage XLPE cable dielectric using different nanoparticles

“…NPs have an important role in increasing the electrical, mechanical, and thermal properties of nano-composites at low concentrations while maintaining other features [2]. In recent years, many authors presented in their studies the development of polymer materials using the composite concept to improve the all properties and increase the lifetime and reliability of the insulators [3][4][5][6][7][8][9][10][11][12].…”