The synthesis of a series of soluble 5-alkoxy substituted isophthalamides is described. Condensation of 1,3-diaminobenzene or 2,6-diaminopyridine with alkoxy substituted isophthaloylchlorides yields the title polyaramides. The influence of the alkyl chain length on the supramolecular structure of the polymer is investigated by X-ray diffraction experiments. Initial results indicate a lamellar type solid lattice for the polymers studied here.