Mechanical properties of PP-LDPE blends with novel morphologies produced with a continuous chaotic advection blender

Dhoble, Ashwinkumar S.; Kulshreshtha, Bhawna; Ramaswami, S.; Zumbrunnen, D. A.

doi:10.1016/j.polymer.2005.01.057

Cited by 45 publications

(35 citation statements)

References 37 publications

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“…It is obvious from Figure 4 that there are a depression in impact strength these values for HDPE and LDPE when mixed with PP, and the depression ratio decreased with increase of weight percentage of PP and that belongs to a rigid shortly methyl group attached to every second carbon atom in the linear molecular chain of PP and this cause PP has relatively low impact strength (Smith & Hashemi, 2006;Dhoble, Kulshreshtha, Ramaswami, & Zumbrunnen, 2005). …”

Section: Impact Test Resultsmentioning

confidence: 99%

“…Studies from other groups showed that incompatibly immiscible polymer blends provide synergy of mechanical properties when the processing and compositional parameters are near optimum values (Petronyuk, Priadilova, Levin, Ledneva, & Popov, 2003;Dhoble, Kulshreshtha, Ramaswami, & Zumbrunnen, 2005;Chen, Zhon, Cai, Su, & Yang, 2007;Wantinee, Richard, & Jayant, 2007). Gui et al (2007) studied the comparison between two types of polypropylene (PP) with different molecular structure, namely, homogeneous PP (PPH) and PP block-copolymer (PPC) blended with LDPE and found these mechanical properties of the LDPE/PPH blend were much higher than that of the LDPE/PPC blend, which was attributable mainly to the fact that the mechanical properties of neat PPH are stronger than that of neat PPC.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of the Characteristics of LDPE : PP and HDPE : PP Polymer Blends

Salih¹,

Hamood²,

Alsabih³

2013

MAS

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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.

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Section: Impact Test Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of the Characteristics of LDPE : PP and HDPE : PP Polymer Blends

Salih¹,

Hamood²,

Alsabih³

2013

MAS

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“…The mixed specimens were marked as HP1, HP2, HP3, and LP1, LP2, LP3 for HDPE/PP and LDPE/PP, respectively. The selection on the mixing ratio of HDPE/PP and LDPE/PP blends was based on past works [2,4,8,[15][16][17][18]. The materials were mixed mechanically using a twin screw extruder, with a 150 rpm screw rotating speed for 5 min.…”

Section: Breakdown Experimentsmentioning

confidence: 99%

Electrical Properties of Polyethylene/Polypropylene Compounds for High-Voltage Insulation

et al. 2018

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Abstract:In high-voltage insulation systems, the most commonly used material is polymeric material because of its high dielectric strength, high resistivity, and low dielectric loss in addition to good chemical and mechanical properties. In this work, various polymer compounds were prepared, consisting of low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), HDPE/PP, and LDPE/PP polymer blends. The relative permittivity and breakdown strength of each sample types were evaluated. In order to determine the physical properties of the prepared samples, the samples were also characterized using differential scanning calorimetry (DSC). The results showed that the dielectric constant of PP increased with the increase of HDPE and LDPE content. The breakdown measurement data for all samples were analyzed using the cumulative probability plot of Weibull distribution. From the acquired results, it was found that the dielectric strengths of LDPE and HDPE were higher than that of PP. Consequently, the addition of LDPE and HDPE to PP increased the breakdown strength of PP, but a variation in the weight ratio (30%, 50% and 70%) did not change significantly the breakdown strength. The DSC measurements showed two exothermic crystallization peaks representing two crystalline phases. In addition, the DSC results showed that the blended samples were physically bonded, and no co-crystallization occurred in the produced blends.

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“…The physical situation has been described previously. 31,36,47,48 The ratio of shear stress forces to interfacial tension forces for injected melts or melt bodies of large diameter (e.g., ∼1 cm or larger) is high, so layers readily deform somewhat analogous to large droplets where capillary numbers exceed a critical value. 49 Because stretching and folding cause interfacial areas to increase substantially, subsequent deformations by shear occur more readily.…”

Section: Wileycom]mentioning

confidence: 99%

“…To inhibit layer delamination, some interconnections may be desirable between layers of each polymer component to give a mechanically interlocked morphology. 25,48 Stir rod speed can be increased to attain a higher N and State 3, where layers are thinner and some ruptures can arise in the thinner LDPE minor component layers. The average size of the ruptures and the rupture population in the extrusion can be adjusted by altering rod speed and N. For flexible manufacturing, a fiber-reinforced morphology may be attractive in another product.…”

Section: Transient Operating Modementioning

confidence: 99%

Smart blending technology enabled by chaotic advection

et al. 2006

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ABSTRACT:Polymer blending has been typically regarded as a mixing process rather than a structuring process so polymer blends and composites are not necessarily optimized with regard to structure, properties, and composition. In this article, a new smart blending technology is described whereby melt components and solid additives are more controllably organized into micrometer-scale and sub-micrometer-scale shapes and arrangements to improve properties or impart functionality to extruded plastics. Chaotic advection is an enabling recent subfield of fluid mechanics for smart blending. It provides a method to controllably stretch and fold melt domains and evolve a multilayered structure leading to derivative morphologies, or indirectly manipulate solid additives. Recent advances in fluid mechanics have thereby been implemented to reconsider how blending is done. A variety of structured plastic materials are producible with a single smart blending device with no device alterations. Several examples and their improved physical properties are shown or discussed.

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Mechanical properties of PP-LDPE blends with novel morphologies produced with a continuous chaotic advection blender

Cited by 45 publications

References 37 publications

Comparison of the Characteristics of LDPE : PP and HDPE : PP Polymer Blends

Comparison of the Characteristics of LDPE : PP and HDPE : PP Polymer Blends

Electrical Properties of Polyethylene/Polypropylene Compounds for High-Voltage Insulation

Smart blending technology enabled by chaotic advection

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