BACKGROUND: THE STRONG HYDROPHILICITY OF NANO-SIO2 PARTICLES ARISING FROM THE HYDROXYL GROUPS ON THE SILICA SURFACE BRINGS ABOUT THE NANOPARTICLES TO BE EASILY AGGLOMERATED AND HARDLY DISPERSIBLE IN POLYMER MATRIX [1, 2]. IN ORDER TO HOMOGENEOUSLY DISPERSION OF NANOSILICA IN A NON-POLAR MEDIA AND COMPATIBILITY IN THE POLYMER MATRIX, SURFACE MODIFICATION OF NANOSILICA PARTICLES IS GENERALLY PERFORMED. IN THIS WORK, TO ENHANCE THE ORGANOPHILICITY OF SILICA NANOPARTICLES NCO-TERMINATED POLYTETRAMETHYLENE OXIDE (PTMO) IS USED. THIS ORGANIFIER IS SYNTHESIZED FROM THE REACTION BETWEEN HEXAMETHYLENE DIISOCYANATE (HDI) AND HYDROXYL-TERMINATED PTMO...