Synthesis of the ionic liquid 1,2‐dimethyl‐3‐butylimidazole bromide salt and its application in phenolic‐formaldehyde‐resin‐based conductive materials

Abstract

AbstractHerein, the ionic liquid 1,2‐dimethyl‐3‐butylimidazole bromide salt ([DMBIm]Br) was synthesized and its chemical structure was characterized via Fourier transform infrared and 1H nuclear magnetic resonance spectroscopies. Moreover, to improve the electrical property of the phenolic formaldehyde (PF) resin, PF/[DMBIm]Br systems were prepared via a melt blending and compression–curing process. Furthermore, the effect of [DMBIm]Br content on the thermal stabilities, mechanical properties, electrical properties, and morphologies of the systems was investigated. The thermal stability of the systems increased with [DMBIm]Br addition. The impact strength of the systems improved with increasing [DMBIm]Br content. Additionally, the volume resistance of the systems significantly decreased from 1.02 × 109 to 1.64 × 107 Ω with increasing [DMBIm]Br content from 0 to 1 wt%.