A series of new polyesters was synthesized by high-temperature solution polycondensation of 1,6- or 4,9-diamantanedicarboxylic acyl chlorides with aryl ether diols. All polyesters had good solubilities and could be soluble in chloroform, nitrobenzene, o-chlorophenol, N-dimethylformamide (DMF), and o-dichlorobenzene. Number-average molecular weights (M-n) of polyesters IV and V were 40 000 similar to 280 000 and 48 000 similar to 150 000, respectively. The glass transition temperatures of polyesters were 90-108 degrees C and 102-132 degrees C, as determined by differential scanning calorimetry (d.s.c.) and dynamic mechanical analysis (DMA), respectively. The temperatures at 5% weight loss of polyesters ranged from 338 to 395 degrees C in air and from 385 to 403 degrees C in Nz atmosphere. Polyesters had tensile strengths of 34.9 similar to 45.5 MPa, elongation to breakage values of 3.5 similar to 4.6%, and initial moduli of 1.4 similar to 1.6 GPa.