A novel class of organosoluble and light-colored fluorinated polyamides derived from 2,2 ′-bis(4-amino-2-trifluoromethylphenoxy)biphenyl or 2,2 ′-bis(4-amino-2-trifluoromethylphenoxy)-1,1 ′-binaphthyl

Abstract

Two series of novel fluorinated aromatic polyamides were prepared from 2,2 ′-bis(4-amino-2-trifluoromethylphenoxy)biphenyl ( 2) and 2,2 ′-bis(4-amino-2-trifluoromethylphenoxy)-1,1 ′-binaphthyl ( 4) with various aromatic dicarboxylic acids using the phosphorylation polycondensation technique. The polyamides had inherent viscosities ranging from 0.43 to 0.62 dl/g and 0.36 to 0.74 dl/g, respectively. All the fluorinated polyamides were soluble in many polar organic solvents such as N, N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone, and afforded transparent, light-colored, and flexible films upon casting from DMAc solvent. These polyamides showed glass-transition temperatures in the ranges of 190–240 °C (for the 6 series from diamine 2) and 247–255 °C (for the 7 series from diamine 4) by differential scanning calorimetry, softening temperatures in the ranges of 196–230 °C ( 6 series) and 241–291 °C ( 7 series) by thermomechanical analysis, and decomposition temperatures for 10% weight loss above 420 °C in both nitrogen and air atmospheres.