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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 (ϵ 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.

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