Soluble aromatic polyamides containing alkyl or alkoxy substituted p-terphenys were prepared. These polyamides were obtained from solution polymerization of 4,4'-diamino-2',5'-dialkyl or dialkoxy p-terphenyls with terephthaloyl dichloride. The new dialkoxy substituted terphenyl diamines were synthesized by the palladium mediated coupling of the 2,5-disubstituted benzene diboronic acid with 4-nitrophenyl boromide and subsequent reduction of nitro groups. The synthesized polyamides were characterized by viscosimetry, thermal analysis and dynamic mechanical analysis. The dialkoxy substituted polyamide has high modulus at room temperature and despite the prescence of aliphatic side chains the modulus remains constant up to 250 degrees C.