Abstract: Low-density polyethylene (PE-LD) melt was grafted with maleic anhydride (MAH) in a twin-screw extruder in presence of an initiator. By enhancing the screw rotation speed, the chains of PE-LD were scissored forming macromolecular radicals, thus promoted the grafting reaction. When the screw rotation speed was 800 r/min, a high percentage of grafting（0.71 %）and a high melt flow rate (0.87 g/10 min), and a low gel content (<0.40 % ) could be obtained. The functionalized product of PE-LD was blended with EPDM and was used as a hot-melt adhesive. When the reaction temperature was 310 ℃, the screw rotation speed was 600 r/min, and the content of EPDM was 80 wt %, the bond strength of T-adhint of the Al/PET film reached 3.87 N/mm.

Key words: high shear stress, low-density polyethylene, functionalization, maleic anhydride, hot-melt adhesives, induction, peeling strength