Two different polyurethane thermoplastic elastomers were used as matrix,organic small molecules hindered phenol AO-80 was added to prepare organic hybrid composites by melt-blending method.The heat properties,dynamic mechanical properties,mechanical properties and heat-resistance properties were investigated.The results showed the crystal AO-80 existed as amorphous state in the composites in the two systems.Along with the amount of AO-80 increased, the soft segment glass transition temperature shifted to hi...