Properties of elongational flow injection‐molded polyethylene part 2: Influence of processing parameters

Abstract

Abstract In the first part of this series, the influence of mold geometry was examined with reference to the improvement of the mechanical properties of elongational flow injection‐molded polyethylene. In the present study (Part 2), processing parameters have been investigated and the physical properties of the moldings examined. It is confirmed that mainly two parameters, the temperature of the melt and the pressure on the solidifying mold, govern the injection process. Results are discussed in terms of the molecular orientation that is developed during the filling process and depends on the temperature of the melt. The application of high pressures leads to a pressure‐induced crystallization effect that freezes in the molecular orientation within the mold.