Studies on mechanical and thermal properties of ternary blends of polyethylenes. I

摘要

Six film samples of varying compositions of linear low-density polyethylene (LLDPE), 10-35 wt %, and high-density polyethylene (HDPE), 40-65 wt %, having a fixed percentage of low-density polyethylene (LDPE) at 25 wt % were extruded by melt blending in a single-screw extruder (L/D ratio = 20 : 1) of uniform thickness of 2 mil. The tensile strength, elongation at break, and impact strength were found to increase up to 60 wt % HDPE addition, starting from 40 wt % HDPE, in the blends and then decreased. The blend sample B-500 was found to be more thermally stable than its counterparts. The appearance of a single peak beyond 45 wt % HDPE content in the blend in dynamic DSC scans showed the formation of miscible blend systems and this was further confirmed by scanning electron microscopic analysis. (c) 2005 Wiley Periodicals, Inc.