In situ formation and processing of ultra high molecular weight polyethylene blends into precursors for high strength and stiffness fibers

Whitehouse, Claire; Liu, Meilin; Gao, Ping

doi:10.1002/pen.11480

Cited by 8 publications

(7 citation statements)

References 27 publications

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“…48 The fibirilar bridges connecting two phases could also be formed as a result of the partial melting of UHMWPE during blending. 49 Thus, the complex crystalline structure cross the amorphous UHMWPE, and the chain penetration contributes to the higher toughness such as the higher yielding stress and the elongation ratio at break.…”

Section: Microscopic Analysesmentioning

confidence: 99%

Modification of polypropylene by melt vibration blending with ultra high molecular weight polyethylene

Wang¹,

Zhou

Zhang

et al. 2002

Adv Polym Technol

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ABSTRACT:A novel vibration internal mixer was used to prepare polypropylene/ultra high molecular weight polyethylene PP/UHMWPE blends with two additional adjustable processing parameters (vibration frequency and vibration amplitude) as compared with those prepared in the steady mode. Microscopy, mechanical tests, and differential scanning calorimetry showed that vibration influenced the blend morphology and the product properties. The good phase homogeneity of the blends might be due to the variation of shear rate either spatially or temporally in blending. Additionally, the vibration internal mixer could be used to analyze the dependency of viscosity on the shear rate. Vibration enhanced the interpenetration of UHMWPE into PP and vice versa. Subsequently, the formed crystals of two components were connected, and there was epitaxy MODIFICATION OF POLYPROPYLENE BY MELT VIBRATION BLENDINGbetween PP and UHMWPE crystals. Moreover, the crystalline aggregates, with the amorphous UHMWPE, formed a complex network-like continuous structure, which improved the elongation ratio at the break and the yield strength. The higher the vibration frequency and/or the larger the vibration amplitude at a fixed average rotation speed of the mixer, the more significant these effects were. The larger amount of the connected crystals, especially of ␤ form of PP in the bulk ␣ form PP as well as with the continuous phase structure, led to a higher tensile properties of PP/UHMWPE vibration blended. C 2002 Wiley Periodicals, Inc.

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Section: Microscopic Analysesmentioning

confidence: 99%

Modification of polypropylene by melt vibration blending with ultra high molecular weight polyethylene

Wang¹,

Zhou

Zhang

et al. 2002

Adv Polym Technol

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show abstract

“…13,14 The high molecular weight of UHMWPE results in a very high viscosity and pronounced viscoelastic characteristics in the melt that makes it unsuitable for conventional processing operations, except the compression molding and ram extrusion. 15,16 Solution or gel-processing methods have been employed to reduce the viscosity of UHMWPE. [17][18][19] Another way to reduce the melt viscosity is to dilute the UHMWPE with polyolefins, those having lower average molecular weights.…”

Section: Polypropylenementioning

confidence: 99%

The Sliding Wear of Polypropylene and Its Blends

Chand¹,

Hashmi²

2009

Polymer Tribology

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Thermoplastic polymers are light in weight and easily process-able materials hence they are extensively used in auto parts and in several other industries. The materials with the unique combination of good friction and wear properties with the easy processing-ability are in demand. Polypropylene and its blends exhibit excellent mechanical and thermal properties coupled with excellent processability. The sliding wear performance of polypropylene or its blends have been improved significantly by introducing UHMWPE. This chapter gives a review on the sliding wear properties of PP and its blends with polyethylene terephthalate (PET) and recycled PET. Mechanism of wear under the sliding wear condition has been explained with the help of wear rates, mechanical properties and worn surfaces. The improved wear performance on loading a small amount of UHMWPE is an interesting feature of these materials. The sliding wear of UHMWPE modified polypropylene and its blends depend primarily upon the composition, sliding conditions, wear mechanism, the coefficient of friction and rise in temperature of interface.

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“…Ultrahigh molecular weight polyethylene (UHMWPE) is characterized by a number of important properties, including high notched impact strength, energy absorption capacity at high loading rates, resistance to stress cracking, and extremely low embrittlement temperatures. Necessarily at these high molecular weights, the PE displays a high viscosity and pronounced viscoelastic characteristics in the melt that make it unsuitable for conventional processing operations, with the exception of compression molding and ram extrusion 1, 2. Numerous efforts have been made to reduce the viscosity by solution or gel processing 3–5.…”

Section: Introductionmentioning

confidence: 99%

Study on processing of ultrahigh molecular weight polyethylene/polypropylene blends

Liu

Chen

2004

J of Applied Polymer Sci

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ABSTRACT:The processing of ultrahigh molecular weight polyethylene (UHMWPE) by the addition of polypropylene (PP) and high-density polyethylene (HDPE) was investigated. The results show that the addition of PP improves the processability of UHMWPE more effectively than does the addition of HDPE. UHMWPE/PP blends can be effectively processed with a twin-roller and general single-screw extruder. In the extrusion of UHMWPE/PP blends, PP is enriched at the surface of the blend adjacent to the barrel wall, thus increasing the frictional force on the wall; the conveyance of the solid down to the channel can then be carried out. The melt pool against the active flight flank exerts a considerable pressure on the UHMWPE powder in the passive flight flank, which overcomes the hard compaction of UHMWPE. The PP penetrates into the gaps between the particles, acting as a heat-transfer agent and adhesive, thus enhancing the heat-transfer ability in the material.

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In situ formation and processing of ultra high molecular weight polyethylene blends into precursors for high strength and stiffness fibers

Cited by 8 publications

References 27 publications

Modification of polypropylene by melt vibration blending with ultra high molecular weight polyethylene

Modification of polypropylene by melt vibration blending with ultra high molecular weight polyethylene

The Sliding Wear of Polypropylene and Its Blends

Study on processing of ultrahigh molecular weight polyethylene/polypropylene blends

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