A novel soluble polyamide containing xanthene structure and trifluoromethylphenoxy pendent

A novel polyamide containing xanthene structure and trifluoromethylphenoxy pendent was prepared from 9,9-bis[4-(4-aminophenoxy)phenyl]xanthene, a novel diamine with 2-(4-trifluoromethylphenoxy)terephthaloyl chloride by the low temperature polycondensation. This new polyamide with the inherent viscosity of 0.95 dL/g was amorphous and readily soluble in polar solvents such as DMAc, m-cresol etc. This polyamide showed the glass transition temperature (Tg) of 236 °C, decomposition temperature (Td) at 5 % weight loss of 455 °C and char yield of 56 % at 800 °C in N2. Transparent, flexible, and tough film of the polymer cast from DMAc solution exhibited tensile strength of 93 MPa, elongation at break of 14 %, initial moduli of 2.2 GPa. The electric properties such as the dielectric constant of 3.03 (1 MHz) and surface resistance (2.78×1014Ω), and the moisture uptake of 1.36 % were also described.