Thermoplastic polyurethane/attapulgite ( TPU/AT ) nanocomposites were pre-pared via solution blending process. The influence of hysteresis, stress softening behavior and stress relaxation effect of the AT on TPU matrix were investigated. The results demon-strated that with the addition of AT,the hysteresis loops were bigger,the stress softening effects were more obvious and the rate and degree of stress relaxation were reduced than those of pure TPU. The molecular motion model of TPU/AT system indicated that the influ-ence of mechanical behav...