OREC (organic rectorite clay)/TPUR(thermoplastic polyurethane) nanocomposites were prepared via melt blending．There were four temperature ranges in the extruder．The temperature was 120℃ at the extruder head

and was 130℃

140℃ and 120℃ in the former

middle and back parts

respectively．OREC was prepared with natural rectorite and dodecanic quaternary ammonium salt through ion-exchange．The nanoscale dispersibility of the OREC layers in the TPUR matrix was revealed by using transmission electron microscopy (TEM). The thermodynamic mechanical analysis (DMA)

thermogravimeric analysis (TG)

oil-resistant and hot air aging of nanocomposites were also measured. The results showed that the largest storage modulus is 7 times more than that of pure TPUR’s

and the largest loss moduli is 4 times more than that of pure TPUR’s．The other thermal properties of the composites have been enhanced as compared with those of the TPUR matrix due to the well-dispersed OREC layered particles in the OREC／TPUR nanocomposites．When the content of OREC is 2％

the initial degradation temperature of the composite is 15℃ higher than that of the pure TPUR

and the ratio of the residual tensile strength to the original strength is over 86％ after oil treatment for 168 h

or air aging at 120℃ for 72 h．