A STUDY ON IMPACT PROPERTIES OF GAMMA-RAY IRRADIATED LLDPE FILLED WITH ALUMINA-TRIHYDRATE

Alumina trihydrate(ATH) can be used as a fire retardant of polyethylen e which is incompatible with ATH. Functional groups(mainly carbonyl an d hydroxyl groups) are introduced to LLDPE molecular chains by gamma-r ays in air so as to improve the affinity between LLDPE and ATH. The ef fect of dose rate on oxidation and degradation of LLDPE exposed to gam ma-rays in air under the same integrated dose, and the impact properti es of LLDPE/gamma-LLDPE/ATH blend were studied in this paper, The expe rimental results show that the lower dose rate favors oxidation and de gradation of LLDPE, gamma-LLDPE can distinctly increase the impact str ength of LLDPE/ATH blend, and improve the dispersion of ATH in LLDPE m atrix, By adding 10% gamma-LLDPE (0.1 kGy/h, 50 kGy) of the matrix to ATH (50% by weight) filled LLDPE, the impact strength of blend can inc rease from 65 J/m to 260 J/m.