Two fluorinated monomers M1 and M2 based on pentafluorostyrene, are synthesized via an aromatic nucleophilic substitution reaction (SNAr) at room temperature, with high yields of up to 90%. Subsequently, M1 and M2 are converted to fluorinated poly(aryl ether)s through thermo-crosslinking. Among the two polymers, cured M2 possessing higher fluorine content, demonstrates superior overall performance with a 5% weight loss temperature (T) of 465 °C, a low water uptake of 0.17% (after immersing in boiling water for 72 h), a low dielectric constant (D) of 2.46 and dielectric loss (D) of 3.65 × 10 at 10 GHz. These properties outperform those of numerous poly(aryl ether)s and commercially available low-dielectric materials. This study provides a facile and effective method for preparing fluorinated poly(aryl ether)s tailored specifically for high-frequency communication applications.
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