Abrasive wear of HDPE/UHMWPE blends

Rosales

J of Applied Polymer Sci

et al. 2017

The mixing of UHMWPE wastes with other polymers aims to reduce the environmental impact of waste materials. The dynamic rheological behavior of the blends, tensile and abrasion properties, Shore D hardness and impact resistance, and morphology are important in characterizing polymer blends. In this work, we have sought to obtain blends containing different proportions of UHMWPE wastes and LDPE with properties suitable for the manufacture of useful products. The blends exhibit an increase in complex viscosities, storage modulus, and Young's modulus with increasing content of UHMWPE wastes and a decrease in both the maximal elongation and Charpy impact resistance. Summarizing, the addition of up to 60 wt % of industrial fragments of UHMWPE is possible using conventional methods of processing to prepare blends with values of tensile strength, abrasion, and Shore D hardness similar to those of LDPE. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44996.

Section: Resultsmentioning

confidence: 99%

Rheological and mechanical properties of blends of LDPE with high contents of UHMWPE wastes

Rosales

J of Applied Polymer Sci

et al. 2017

“…UHMWPE is a thermoplastic polymer that has excellent properties of wear resistance, self-lubrication, fatigue resistance, impact resistance, high chemical stability, resistance to low temperature and biocompatibility [9,10]. UHMWPE is widely used in medical, industrial, military and consumer applications [11].…”

Section: Ultra High Molecular Weight Polyethylene (Uhmwpe)mentioning

confidence: 99%

Influence of laser power on tensile properties and material characteristics of laser-sintered UHMWPE

2016

-Ultra High Molecular Weight Polyethylene (UHMWPE) has excellent properties, such as high mechanical performance, low friction, high wear and chemical resistance but so far there has been limited use in additive manufacturing (AM). Laser sintering of polymers is one of the most promising AM technologies due to its ability to produce complex geometries with accurate dimensions and good mechanical properties. Consequently, this study investigates the influence of laser power on physical and mechanical properties of UHMWPE parts produced by laser sintering. In particular mechanical properties, such as Ultimate Tensile Strength (UTS), Young's Modulus and elongation at break were evaluated alongside relative density, dilation and shrinkage. Finally, the fracture surface of the tensile test specimens was examined by electron microscopy. Results show that within a laser power range of 6-12 W there appears to be an optimum where tensile strength and relative density reach a maximum, dilation is minimised and where elongation increases with laser power. UTS up to 2.42 MPa, modulus up to 72.6 MPa and elongation at break up to 51.4% were observed. Relative density and part dimensions are also influenced by laser power.

“…Ultra-high molecular weight polyethylene (UHMWPE) is a high performance thermoplastic with outstanding mechanical properties, such as high wear strength, chemical resistance and high toughness, which provide not only practical benefits but also scientific interest (Kelly, 2002;Lucas et al, 2011;Lim et al, 2005). However, it's extremely high molecular weight, and subsequent high viscosity, raises difficulties in processing using standard techniques, such as twin screw extrusion and compression moulding.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle type effects on the scratch resistance of polyethylene-based nanocomposites

Alghamdi

2017

Int. j. adv. appl. sci

The purpose of this paper is to investigate the effect of nanoparticle type on the scratch resistance of polyethylene-based nanocomposites at two ambient temperatures and various scratch velocities. An in-house pre-mix procedure is used to enhance the scratch resistance of polyethylene blend by the addition of three different types of nanoparticles, which are compatible with the host matrix. The results showed a good dispersion of nanoparticles into the host material matrix. The scratch resistance of polyethylene-based nanocomposites is significantly influenced by the type of nanoparticles at both testing temperatures. The addition of low volume fraction (0.5 wt.%) of nanoclay and CNT showed a significant increase in the scratch resistance of nanocomposite material at the highest scratching velocity for both testing temperatures. While, slight effect of the embedding of nanoclay was indicated at low scratch velocity. The addition of 0.5 wt% CB resulted in a reduction in the scratch resistance at all testing parameters.