Studies on Mechanical and Thermal Properties of Ternary Blends of Polyethylenes Having Fixed Percentage of High-Density Polyethylene - II

摘要

Six film samples of varying compositions of low-density polyethylene (LDPE);(20-45 wt) and linear low-density polyethylene (LLDPE);(25-45 wt) having a fixed percentage of high-density polyethylene (HDPE) at 30 wt have been extruded by melt blending in a single screw extruder (L/D ratio=20:1) of uniform thickness of 2 mil.The tensile strength and elongation at break have been found to increase up to 40 wt with LLDPE addition,starting from 25 wt LLDPE,in the blends and then decreased.The blend sample containing 30 wt LDPE,40 wt LLDPE,and 30 wt HDPE (sample C-300) was found to be more thermally stable blend amongst all the prepared blends.In most of the blends,two exothermic peaks appeared that showed the formation of immiscible blend systems;this was further confirmed by scanning electron microscopic (SEM) analysis.