Abstract
Mechanical properties of blend of high density polyethylene (HDPE) and low density polyethylene (LDPE) have been investigated. Four different HDPE/LDPE blends with various ratio (80/20,60/40,40/60, and 20/80) were prepared by melt-mixing technique using mini-twin-extruder at 200 ᵒC and 90rpm. Characterization tests including tensile and impact strength tests as well as hardness have been performed in order to better understand the behavior of these blends. Information on ductility and toughness were obtained from the stress-strain curves of HDPE/LDPE blends. Mechanical properties were varied according to LDPE content. Blends-rich with LDPE showed to have lower strength and hardness and higher elongation, impact strength, ductility and toughness than blends-rich with HDPE. Blend with the composition (HDPE (40)/LDPE (60)) showed comparatively better overall mechanical properties.
Highlights
Polymer blends have become more popular in research and in application because they offer a key option in solving emerging application requirements
Polymer blends offer a route for combining the favorable properties of different polymers to enhance various properties, which could not be obtained through the use of a single polymer
The hardest material is high density polyethylene (HDPE), while the softest materials are low density polyethylene (LDPE). This is expected since LDPE is softer and has low tensile strength compared to HDPE because it has lower crystallinity content [34], as explained above
Summary
Polymer blends have become more popular in research and in application because they offer a key option in solving emerging application requirements. Blending was reported to improve process ability and mechanical properties of the neat PEs; HDPE, LDPE and LLDPE [2]. The influence of LDPE content on the mechanical properties of HDPE/ LDPE blends was studied.
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