High‐Temperature and High‐Energy‐Density Dipolar Glass Polymers Based on Sulfonylated Poly(2, 6‐dimethyl‐1, 4‐phenylene oxide). (16th January 2018) - Zhang, Zhongbo
Abstract: A new class of high‐temperature dipolar polymers based on sulfonylated poly(2, 6‐dimethyl‐1, 4‐phenylene oxide) (SO2 ‐PPO) was synthesized by post‐polymer functionalization. Owing to the efficient rotation of highly polar methylsulfonyl side groups below the glass transition temperature ( T g ≈220 °C), the dipolar polarization of these SO2 ‐PPOs was enhanced, and thus the dielectric constant was high. Consequently, the discharge energy density reached up to 22 J cm −3 . Owing to its high T g , the SO2 ‐PPO25 sample also exhibited a low dielectric loss. For example, the dissipation factor (tan δ) was 0.003, and the discharge efficiency at 800 MV m −1 was 92 %. Therefore, these dipolar glass polymers are promising for high‐temperature, high‐energy‐density, and low‐loss electrical energy storage applications.