Synthesis and characterization of amorphous fluorinated polyarylether prepared from phenolphthalein and decafluorobiphenyl

Abstract

Poly(arylene ether)s with different molecular weights were synthesized via a two‐step nucleophilic substitution polymerization by adjusting reaction parameters based on phenolphthalein (PHT) and decafluorobiphenyl (DFBP). The chemical structures and properties were identified by Fourier transform infrared, NMR, gel permeation chromatography, differential scanning calorimetry, thermogravimetric analysis, dynamic thermomechanical analysis (DMA), and so forth. The number‐average molecular weight (Mn) of the resulting polymers was in the range of 23.0–49.3KDa. FPAEs (polyarylether including perfluorobiphenyl structure) were demonstrated to have outstanding thermo‐resistance with 5% weight loss temperature of about 482–520°C (N2) and high‐glass transition temperature (about 240–250°C). FPAEs can be dissolved in conventional organic solvents, possessing excellent film‐forming properties. The good mechanical properties of FPAEs were confirmed by the DMA data, with Young's modulus greater than 1.0 Gpa and modulus retention rate at 230°C >67%. FPAEs also showed good hydrophobicity and low‐water absorption, in particular, FPAE‐1 (FPAE‐1‐5 were the polycondensation products of PHT and DFBP, just the polymerization conditions were slightly modified) exhibited favorable dielectric properties: at 1 MHz, the dielectric constant and dielectric loss was 2.58 and 0.0053, respectively. Thus, FPAE‐1 has broad prospective applications in microelectronic devices and communication technology.

Development of a light-responsive fluorinated poly(arylene ether) copolymer containing azobenzene groups in the main polymer chain

“…21 Despite significant advances in the chemistry of azo-based PAEs, the importance of azo-containing PAEs with perfluorinated aromatic fragments (FPAEs) is somewhat neglected in the literature. However, azo-free FPAEs themselves possess unique properties that are essential for effective functioning in modern high-tech applications, particularly in microelectronics, [22][23][24] optical telecommunications, [25][26][27] and fuel cell membrane technology. [28][29][30] In addition to the expected improvement in chemical and thermal stability, the introduction of perfluorinated aromatic units into the polymer structure allows for upgrading their optical and electro-optical properties, particularly to reduce refractive index and optical losses and to increase hyperpolarization.…”