A series of new polyamides 3 were synthesized by direct polycondensation of the 1,6-bis [4-(4-aminophenoxy)phenyl] diamantane (1) with various dicarboxylic acids. The polyamides had inherent viscosities of 0.45-1.90 dL/g and number-average molecular weights (M-n) of 24,000-110,000. Dynamic mechanical analysis (DMA) reveals that polymers 3 have two relaxations on the temperature scale between - 100 and 400 degrees C. Their cu relaxations occurred at high temperatures, ranging from 338 to 389 degrees C. Moreover, these polymers remained quite stable at high temperatures and maintained good mechanical properties (G＇ = ca. 10(8) Pa) up to temperatures close to the main transition markedly exceeding 350 degrees C. Due to the bulky diamantane elements and the flexible ether segments, the polymers 3 were amorphous and soluble in a number of organic solvents such as pyridine, N-methyl-2-pyrrolidone (NMP), and N,N-dimethylacetamide (DMAc). The polyamides 3 have tensile strengths of 56.7-90.2 MPa, elongation to breakage values of 7.5-27.7%, and initial moduli of 1.8-2.1 GPa.