An investigation of the impact behavior of rotomulded polyethylenes over a wide temperature range

摘要

This paper examines the relationship between the impact strength of rotationally moulded polyethylene parts and the dynamic mechanical properties. A range of conventional linear low density polyethylene powders (LLDPE) and metallocene polyethylene powders (MPE) were rotationally moulded and tested. Falling weight impact tests were carried out over a temperature range from -60°C to 20°C. Dynamic mechanical thermal analysis (DMTA) was carried out from -100 to 90°C, at different frequencies. Transitions evident in DMTA results are used to explain sub-zero maxima in the impact strength of the polymers tested.