High Optical Transparency and Low Dielectric Constant of Organosoluble Poly(aryl ether amides) Based on 1, 2-Bis (4-amino-2-trifluoromethylphenoxy) benzene and Aromatic Dicarboxylic acids

A series of novel fluorinated poly(aryl ether amide)s(PEAs) were prepared from an aromatic diamine containing trifluoromethyl group (─ CF3), 1,2-bis(4-amino-2-trifluoromethylphenoxy)benzene(1 Cassidy, P. E. 1980. Thermally Stable Polymers: Synthesis and Properties, 685–686. New York: Marcel Dekker. [Google Scholar]),with various aromatic dicarboxylic acids using the phosphorylation polycondensation. The fluorinated PEAs were obtained in almost quantitative yields with inherent viscosities ranging from 0.55 to 0.78 dl/g. All the PEAs showed high solubility in many polar organic solvents such as N-methyl-2-pyrrolidinone (NMP), dimethyl sulfoxide (DMSO) and tetrahydrofuran (THF) and so on. Flexible and tough polymer films could be easily prepared by casting from DMAc solvent. The PEAs films exhibited high optical transparency with a cutoff wavelength of 336–357 nm and good mechanical properties with tensile strengths of 78.4–104.8 MPa and elongations at break of 5.4–10.3%. They showed high glass transition temperatures in the range of 227–244°C. They also exhibited good thermal stability, the 10% wt loss temperatures from 453 to 464°C in nitrogen atmosphere. Meanwhile, the obtained PEAs films possessed low dielectric constants of 2.42–2.80 at 1 MHz and low moisture absorption (1.27–2.36%). Due to their properties, the polyamides could be considered as engineering microelectronic and photoelectric materials.