Series of polyamides and polyesters containing 2,2-di-2''-thienylpropane links were synthesized by the interfacial polycondensation of 2,2-di-(5-carbonylchloro-2-thienyl) propane with various diamines or diols. And the structures of these polymers were identified by infrared spectroscopy. Characteristic absorption bands of polyamides appeared at 3380-3240cm_-1 (NH stretching), 1670-1640cm_-1 (amide I band), and 1560-1540cm_-1 (amide II band) and that of polyesters was observed at 1750-1720cm_-1(carbonyl stretching of ester group) The resulting polyamides had inherent viscosities in the range of 0.25-0.69 dl/g and those of polyesters were 0.12-0.33dl/g And polyamides were obtained in higher yields than polyesters. Although most of the polyamides were soluble in polar solvents, polyesters were quite insoluble in common organic solvents. These polymers revealed relatively good thermal stability. The TGA data showed 5% weight losses of polyamides at 257-383℃ and those of polyesters at 244-308℃.

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