Preparation and Properties of Novel Cross-Linked Fluorinated Poly(aryl ether) with Low Dielectric Constant and High Thermal Stability

Fluorinated poly(aryl ether)s (FPAEs) have attracted much attention due to their high thermal stability, excellent mechanical strength, and low dielectric constant. High-molecular-weight fluorinated poly(aryl ether) containing phenylethynyl (FPAE-PE) is successfully synthesized by nucleophilic substitution between 3-ethynylphenol and FPAE. The cross-linked fluorinated poly(aryl ether) (C-FPAE-PE) is prepared by thermal treatment of FPAE-PE at 300 degrees C. The thermal stability, dynamic thermomechanical property, and dielectric performance of C-FPAE-PE are systematically studied. C-FPAE-PE has excellent heat resistance with 5% weight loss temperature (T-d5%) at 490 degrees C in air and high thermomechanical properties with storage modulus retention of 50% at 215 degrees C. C-FPAE-PE displays low and steady dielectric constant of 2.4 and dielectric loss of 0.004 at 215 degrees C, exhibiting potential applications in the field of microelectronics, communication technology, and energy storage as high-temperature low dielectric materials.