Abstract: Low density polyethylene(PE-LD ) was blended with various inorganic nano particles and light stabilizer to enhance its resistance to photo-oxidative degradation in high altitude areas. Carbonyl index was determined using infrared absorption spectroscopy(IRS) and used as a characteristic of aging behavior. A small amount of .inorganic nano particles, such as SiOz and ZnO, played very good function for shielding  ultraviolet(UV) light and inhibiting photo-oxidative degradation. These inorganic nano partides exhibited an obvious synergetic effect with light stabilizers. The effectiveness of the inorganic nano particles was in the order ofZnO> SiO2>Al2O3.

Key words: inorganic nano particle, low density polyethylene film, aging behavior, high altitude