Abstract
Comparative studies have been made on the mechanical properties of High density polyethylene/polypropylene (HDPE : PP) and Low density polyethylene/polypropylene (LDPE : PP) binary blends. Morphological analysis has been also performed using SEM. Blends have been prepared by melt mixing in an extruder. Mechanical tests were performed on the two groups of binary blends. Binary blends (HDPE : PP) gave higher values of tensile strength, fracture strength, young modulus, hardness, creep rate and creep modulus than LDPE : PP. The blend of ratio 20%HDPE : 80%PP shows superior mechanical properties, this blend could bear a load of 846.9 N with an extension of 3.94 mm. SEM results indicated that 20HDPE : 80PP and 20LDPE : 80PP are immiscible blends.
Highlights
Plastics have become quite important and widely used materials in daily life and industry for the last forty years
The results show pure polypropylene has higher mechanical properties than the both types of polymer blends components and that related to PP have a rigid shortly methyl group attached to every second carbon atom of the polymer main chain, which restricts rotation of the chain producing a stronger but less flexible material (Smith & Hashemi, 2006), whereas High density polyethylene/polypropylene (HDPE) and Low density polyethylene/polypropylene (LDPE) show elastic behavior, so they have lower tensile strength and higher elongation as compared to pure PP, from the other hand these figures show the behavior of both types of blends which are intermediate between their pure polymers
The mechanical properties for both groups of blends (Ultimate tensile strength, Fracture strength, Young modulus and elongation) presented as a function of PP content in Figures 3 a, b, c and d respectively which indicate to the increasing of all the mechanical properties with increasing PP content except elongation property which decreased with the increment of PP due to the fact that PP is strong as compared with HDPE and LDPE
Summary
Plastics have become quite important and widely used materials in daily life and industry for the last forty years. A new approach to the science and technology of polymer blends has emerged recently. These polymeric materials must perform under strenuous mechanical, chemical, thermal and electrical conditions imposed by the requirements of a specific application (Xavier, 2003; Smith & Hashemi, 2006; Samsudin, Hassan, Mokhtar, & Jamalludin, 2006; Altan & Yildirim, 2010; Altan, Yildirin, & Uysal, 2011; Caliskan, Akinci, Yilimaz, & Sen, 2011; Ronkay, 2011). Blending of chemically different polymers is an important tool in industrial production for tailoring products with optimized material properties. A variety of morphologies exist such as dispersed spheres of one polymer in another, lamellar structures, and co-continuous phases (Kukaleva, Cser, Jollands, & Kosior, 2000)
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