FRACTURE BEHAVIOR STUDY OF MELT COMPOUNDED POLYCARBONATE/ALUMINA NANOCOMPOSITES

摘要

Two different molecular weight poly(styrene-maleic anhydride) (SMA) copolymers were used to treat spherical alumina nanoparticles to facilitate dispersion. The treated nanoparticles were then melt compounded with polycarbonate (PC) using a high intensity thermokinetic mixer. It was found that the low molecular weight polymer coating resulted in well dispersed nanoparticles in the nanocomposites with fairly high light transmittance. Furthermore, the addition of the spherical nanoparticles improved the impact strength during brittle fracture of the resultant nanocomposites through the formation of multilevel microcracks and microcrazes induced by the nanoparticles.