Add time:08/26/2019         Source:sciencedirect.com

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.

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