GRAFTING EXTRUSION OF LOW DENSITY POLYETHYLENES

摘要

The grafting of low density polyethylenes with diethylmaleate was carried out in a twin screw extruder. A lower grafting degree was found in the material that showed a higher viscosity in the element of the extruder just below the feed port. The weight-average molecular weight of the grafted materials slightly decreased. However, the Newtonian viscosity and the storage modulus increased when compared to virgin resins. Those facts indicate that chain scission processes are taking place simultaneously with long-chain branching formation.