An aromatic diamine containing both sulfone and diphenyl ether groups, bis[4-(4-aminophenoxy)phenyl]sulfone, was synthesized in a two-step way, whose structure was confirmed through Fourier transform infrared spectrometry, nuclear magnetic resonance, and elemental analysis. Then, the obtained BAPS was used as the chain-extender to prepare a polyurethane-urea elastomer whose morphology, thermal stability and mechanical properties were examined by means of attenuated total reflection, DSC, thermogravimetric analysis, dynamic mechanical thermal analysis, and stress-strain measurements. The results showed that the PIJIJ elastomer based on BAPS showed good heat-resistance and mechanical properties. (c) 2007 Wiley Periodicals, Inc.