Rheological and mechanical behavior of the UHMWPE/MDPE mixtures

Dumoun, M. M.; Utracki, L. A.; Lara, J.

doi:10.1002/pen.760240209

Cited by 53 publications

(27 citation statements)

References 8 publications

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“…A similar result was reported in a previous report. 9 Dumoulin et al 9 studied polymer blends of medium-density polyethylene (MDPE) and UHMW-PE at the blend ratio of 98 : 2. Optical observation showed that UHMW-PE was dispersed as particles with 10 -50 m diameter.…”

Section: Strain-rate-independent Linear Elongational Viscositymentioning

confidence: 99%

“…However, it was reported by Dumoulin et al that incorporation of the UHMW polymer into the matrix polymer to make a homogeneous phase with melt compounding had failed. 9 Thus, a different sample preparation method, in the following three steps, was tried: solution blend, cast film, and hot press. Poly(methyl methacrylate) (PMMA) and poly-(acrylonitrile-co-styrene) (AS, 30 wt % of AN) from Asahi Chemical Industry Co., Ltd. were used.…”

Section: Experimental Preparation Of Samplesmentioning

confidence: 99%

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Elongational viscosity for miscible and immiscible polymer blends. II. Blends with a small amount of UHMW polymer

Takahashi

Takimoto

Koyama

1999

J. Appl. Polym. Sci.

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ABSTRACT:The effect of miscibility on elongational viscosity of polymer blends was investigated in homogeneous, miscible, and immiscible states by the blend of 1.5 wt % of ultrahigh-molecular-weight (UHMW) polymer. The matrix polymer was either poly-(methyl methacrylate) (PMMA), or poly(acrylonitrile-co-styrene) (AS) that has a comparable elongational viscosity value. The homogeneous blend consisted of 98.5 wt % of PMMA and 1.5 wt % of UHMW-PMMA. The miscible blend was composed of AS and UHMW-PMMA at the same ratio. The immiscible blend was a combination of AS and UHMW-polystyrene (PS) at the same ratio. The strain-hardening behavior of the different blends were compared with that of pure PMMA. It was demonstrated that 1.5 wt % of UHMW induces a strong strain-hardening property in the homogeneous and miscible blends but was hardly changed in the immiscible blend. The optical microscope observation of the immiscible blend suggested that the UHMW domains were stretched, but that the degree of domain deformation was less than a given elongational strain. It was concluded that the strain-hardening property is strongly affected by the miscibility of UHMW chain and matrix. The strong strain-hardening property is caused by the deformation of the UHMW polymer. UHMW chains are stretched when they are entangled with surrounding polymers. However, UHMW chains in an immiscible state are not so deformed because of viscosity difference and no entanglements between domain and matrix. A smaller degree of UHMW chain deformation in immiscible state results in weaker strain-hardening property.

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Section: Strain-rate-independent Linear Elongational Viscositymentioning

confidence: 99%

Section: Experimental Preparation Of Samplesmentioning

confidence: 99%

Elongational viscosity for miscible and immiscible polymer blends. II. Blends with a small amount of UHMW polymer

Takahashi

Takimoto

Koyama

1999

J. Appl. Polym. Sci.

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“…[1][2][3][4] Furthermore, its sensitivity to melt shearing, as reflected in the early appearance of melt fracture and chain scission, demands less conventional and low-shear processes, such as compaction and sintering, compression molding, or ram extrusion. An additional possibility of exploiting the valuable properties of this material is by blending it with another polymer, either by solvent blending [5][6][7] or melt mixing, 6,7 as in the present study. The effects of high-energy radiation on polyethylene are of considerable scientific and commercial importance, and have been studied in some detail.…”

Section: Introductionmentioning

confidence: 96%

HIPS/?-irradiated UHMWPE/carbon black blends: Structuring and enhancement of mechanical properties

Breuer

Tzur

Narkis

et al. 1999

J. Appl. Polym. Sci.

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CB-containing HIPS/UHMWPE and HIPS/XL-UHMWPE are unique systems, in which structuring takes place, affecting the electrical (to be described in a future article), rheological, mechanical, and dynamical-mechanical properties. The XL-UHMWPE particles have undergone structural fixation due to the crosslinking, maintaining their porosity and internal intricate structure even after high-temperature melt processing, as opposed to the UHMWPE particles. Differences in the flow mechanisms of HIPS/UHMWPE and HIPS/XL-UHMWPE blends have been attributed to polymer viscous flow in the former case vs. particle slippage in the latter. The mechanical properties of HIPS/UHMWPE are enhanced when utilizing XL-UHMWPE as a dispersed phase, especially the strength, because of changes in the inherent properties of the UHMWPE following irradiation, and in particular, the nature of the HIPS/XL-UHMWPE interface. The results for the CB-containing 70HIPS/30XL-UHMWPE blend are especially surprising and of practical importance, due to the fact that no degradation of the mechanical properties has occurred as a result of the CB incorporation. The dynamical mechanical properties reflect the differences between the UHMWPE and XL-UHMWPE-containing blends as well. The presence of either type of UHMWPE, CB content, and blend composition affect the dissipation, but have only a minor influence on the transition temperatures of the components. Of special interest is the increased damping of XL-UHMWPE-containing compositions.

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“…This behavior was also reported by Min et al, 16 where they observed that addition of HDPE to PS leads to reduced elongation at break during extensional viscosity measurements of blends leading to unstable drawing. The phenomenon of strain hardening in polymers 22,23 is critical to stable filament drawing operations since strain-hardened materials exhibit a strong resistance against fast stretching of polymer melts, which in turn imparts draw rate stability. Thus, when neat HDPE was spun, the molten strand showed severe necking instabilities after emerging from the die and subsequent rupture of filaments occurred.…”

Section: Melt-drawing Of Blendsmentioning

confidence: 99%

Investigation into the morphology and mechanical properties of melt‐drawn filaments from uncompatibilized blends of polystyrene and high‐density polyethylene

Cherian

Lehman

VanNess

2006

J of Applied Polymer Sci

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Uncompatibilized immiscible blends of polystyrene (PS) and high-density polyethylene (HDPE) were melt-processed in a single-screw extruder fitted with a fine screen mesh and capillary die and were further drawn into filaments to produce near-nanoscale immiscible domains. The resultant morphologies and mechanical properties were studied for these structures in which load transfer is achieved solely by mechanical linkages between blend domains. The morphology of the blends revealed co-continuity approximately in the range of 45-47 volume percent PS. The development of a three-dimensional co-continuous network in 45 vol% PS, as revealed by morphology observations, was also related to a decrease in extruder output rate in this region, an indicator of the melt interaction of the two phases as co-continuity is achieved. Image analysis revealed submicron fibrillar structures near the phase inversion composition where domain sizes ranged from 6-220 nm with an average domain size of 90 nm. Tensile modulus increased with increasing PS content (E ¼ 2.7 GPa at 47% PS) over the entire blend range with values greater than the rule of mixtures up to 50% PS. Strain to failure did not seem to be influenced by co-continuous morphologies and the fine dispersion of PS domains appears to constrain the fundamentally high strain of HDPE.

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Rheological and mechanical behavior of the UHMWPE/MDPE mixtures

Cited by 53 publications

References 8 publications

Elongational viscosity for miscible and immiscible polymer blends. II. Blends with a small amount of UHMW polymer

Elongational viscosity for miscible and immiscible polymer blends. II. Blends with a small amount of UHMW polymer

HIPS/?-irradiated UHMWPE/carbon black blends: Structuring and enhancement of mechanical properties

Investigation into the morphology and mechanical properties of melt‐drawn filaments from uncompatibilized blends of polystyrene and high‐density polyethylene

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