Facile synthesis of fluorinated poly(arylene ether nitrile) and its dielectric properties

Abstract

ABSTRACT A new class of specialty polymer, fluorinated poly(arylene ether nitrile) (PAEN‐F), was synthesized via the aromatic nucleophilic substitution reaction. Due to its rigid structure, PAEN‐F exhibited enhanced heat resistance and thermal stability. Consequently, the glass‐transition temperature and initial degradation temperature of PAEN‐F reached as high as 179°C and 554°C, respectively. PAEN‐F also showed excellent solubility in low‐boiling solvents owing to fluorine groups and the nonplanar structure in the repeat unit. Due to its strong 6F dipoles, PAEN‐F exhibited a high dielectric constant (ɛ r ) of 3.6, a high electrical breakdown strength of 346 MV/m, and a reasonably low dissipation factor (tan δ) of 0.014 at 25°C and 100 Hz. Therefore, this dipolar glass polymer is promising for high‐temperature and low‐loss electric energy storage applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46837.