Ternary Blends of Polyethylenes: A Study on its Thermal and Mechanical Properties
Rahul Gupta, Deepak Srivastava
Deptt. of Plastic TEch., HBTI, Kanpur
India

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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 %age of low-density polyethylene (LDPE) at 25 wt%
have been extruded by melt blending in a single screw extruder (L/D ratio = 20:1) of uniform thickness of 2-mil. The infra-red spectrum of the film sample, B-500, was recorded with Perkin-Elmer spectrophotometer in the wave-length range of 400-4000 cm -1 to study the formation of oxygenated and unsaturated groups during the mixing of the components. The mechanical and thermal preoperties of these blend samples were evaluated. The tensile strength, Elongation-at-break and impact failure load have been found to increase upto 60 wt%HDPE addition, starting from 40 wt% HDPE addition, in LLDPE and then decreased. The initial degradation temperature (IDT) has been evaluated for blend composition having LDPE:LLDPE:HDPE = 25:15:60 from thermogravimetric analyzer (TGA) and it was found to be 323°C. Differential scanning calorimetric analysis (DSC) was also performed for all composition range to investigate the effect of melting temperature with HDPE content in LDPE. The single peak appearance in DSC scans showed the formation of homogeneous blend systems.