Introduction . Polymer nanocomposites dispersed with nanoparticles exhibit significantly improved mechanical, electrical and thermal properties compared to pure polymers1 , 2 , 3 , 4 , 5 , 6. It is generally believed that the emerging nanoparticle-polymer interface is essential for achieving their property enhancements7 , 8 , 9 , 10. The conformation of the interfacial polymers (e.g., segregation of chain ends, the density of polymer segments and orientation o...