High thermal stability and rigid rod of novel organosoluble polyimides and polyamides based on bulky and noncoplanar naphthalene-biphenyldiamine

The synthesis of a naphthalene-substituted monomer, 2,2′- dinaphthylbiphenyl-4,4′-diamine, and its use in the preparation of soluble polyimides and polyamides by reaction of the diamine with commercial dianhydrides and dicarboxylic acids, was analyzed. IR spectra of synthesized monomers and polymers were recorded in the range 4000-500 cm-1 on a Jasco IR-700 spectrometer. The inherent viscosities of all polymers were measured using a Ubbelohde viscometer. The solubility, tensile properties, thermal properties, and dielectric constants of the obtained polyimides and polyamides were also investigated.