The mechanical properties and the associated plastically deformed morphologies of high density polyethylene films were investigated by tensile testing, wideangle xray scattering and transmission electron microscopy. Ecofriendly, low density and high mechanical properties of the composite have made them good reinforcing materials for the synthesis of composite materials. Blending of polyethylenes permits to combine the superior mechanical properties of highdensity material with the higher purity that is. Hdpechitosan blends modified with organobentonite synthesized with. But the three basic physical properties factors that regulate physical properties are molecular weight, molecular weight distribution and density.
Pdf mechanical and chemical properties of high density. This is due to the natural properties that come with each type of plastic. Mechanical and chemical properties of high density polyethylene. Mechanical properties of hdpe m624 with three filler inorganic and organic composites were assessed with respect to the effect of the filler content. From this relationship, we can associate changes in physical properties as shown in table 11 with changes in melt index of the material. Pdf mechanical properties of high density polyethylenecement. Mechanical properties of low density polyethylene request pdf. Uniaxially oriented films having a welldefined stacked lamellar morphology, both with and without rownucleated structure.
As a result, its melt viscosity is extremely high and normally can only be processed by powder sintering methods. Mechanical properties test reveals that the best ratio of uhmwpehdpe is 6040. Rasha abd alredha ghani lecturer, university of kufa, faculty of engineering, iraq. Ldpe is naturally more flexible and has a lower melting point compared to hdpe which is stronger, more rigid and can withstand more heat. Lignocellulose lc filler from the round basis of date palm leaf cultivaf content 27. Hdpeckd composites with various ckd content 0,2,4,6, and 8wt% samples were prepared by melt extrusion followed by injection molding. High density polyethylene injection of grade scpilex m624 mi 6. Studies on biodegradability and mechanical properties of. Although the presence of hdpe in the blends enabled melt processing, the presence of uhmwpe helped to improve the toughness of the resulting blends. Among the factors controlling the physical properties of hdpe are mfr, density, molecular weight, molecular weight distribution, crystallinity, double bonds, branched species, etc. Studing the mechanical properties and morphology of ternary. Polyethylene foam has a melting point of 80 degrees celsius. Mechanical, thermal and crystallization properties of polypropylene pp reinforced composites with high density polyethylene hdpe as matrix harekrushna sutar1,2, prakash chandra sahoo2, prateekshya suman sahu2, surajabala sahoo2, rabiranjan. The high density polyethylene is a thermoplastic resin.
The mechanical properties are flexural strength, tensile strength, and hardness. Mechanical and chemical properties of high density. Physical chemistry and mechanical properties of hdpe. Hdpe is a hydrocarbon polymer prepared from ethylenepetroleum by a catalytic process. Mechanical properties of fly ash filled high density. High density polyethylene hdpe resin designed for blow. The graph bars on the material properties cards further below compare hdpe to. Tipelin is the registered trade mark for medium and high density polyethylene grades manufactured by mol petrochemicals co. High density polyethylene manufacturing process sciencing. Mechanical properties of high density polyethylene carbon nanotube composites.
Hdpe is known for its high strengthto density ratio. Mechanical properties of high density polyethylene fiber concrete afrah abdulwahhab jaber alkraidi lecturer, university of kufa, faculty of engineering, iraq. Water absorption and mechanical properties of high density. Pdf a viable solution for reducing the negative environment impact of cement kiln dust ckd is to combine with polymeric materials to. Investigation of mechanical properties of carbon nanotubes. The following serves to outline the benefits of high density polyethylene hdpe. Engineering properties of polyethylene 3 weight will have a comparatively high melt index. It is a kind of thermoplastic which is famous for its tensile strength. High density polyethylene hdpe low density polyethylene ldpe. Polyethylene is the most common form of plastic in the world and can be processed in a number of ways to make it thin, flexible, fluffy or strong and hard such as with hdpe. Low pressure high density polyethylene in 1953, it was discovered that ethylene could be polymerised at low pressures to form a linear polymer with high density polyethylene hdpe and it resulted from the work of ziegler on the low pressure polymerisation of ethylene using organometallic catalysts.
In this case, the uhmwpe and hdpe phases are efficiently dispersed and combine, showing the excellent synergy. Fires can be extinguished by conventional means with water and water mist preferred. This research aims to improve the mechanical properties of concrete by using polyethylene fibers obtained from plastic cans, higher tensile and flexural strength obtained by using this type of fiber. The latest grade of high density polyethylene pe100 resins offer engineers the opportunity to design pipe networks using the fit for purpose method rather than follow a prescribed route. An article of manufacture which includes a barrier layer formed of a high density polyethylene composition comprising. The material cannot be cemented, but it is easily welded with a plastic welder. Properties and applications of hdpe or high density polyethylene. Mechanical properties of high density polyethylenecarbon.
Hdpe has greater tensile strength, heat distortion temperature, viscosity, and chemical resistance than ldpe, but has lower impact strength. In this study, blends based on a high density polyethylene hdpe and. High density polyethylene was chosen as it is a commodity polymer, easily available at economical price and easy to process. Overview of materials for high density polyethylene hdpe. The hdpe high density polyethylene tested showed significant changes of temperature stability and mechanical properties after irradiation. For example, it was demonstrated that a pure high density polyethylene hdpe.
Hdpe is also nontoxic and nonstaining and meets fda and usda certification for food processing. Nanotubes high density polyethylene composites produced by extrusion method by mustafa tasyurek serafettin ekinci murat mirik in this study, mechanical properties of multiwalled carbon nanotubes high density polyethylene mwcnthdpe nanocomposite materials produced by method of injection molding have been investigated experimentally. Obvious improvement in the mechanical parameters was recorded depending on the filler type and mesh size. High density polyethylene physical properties metric. Uhmwpe fibers have a high strength and a high modulus resistance against deformation in the fiber direction.
Benefits of high density polyethylene hdpe clean it up. In recent years, many researches focused on the polymer materials to study the characteristics and to enhance the mechanical properties of the nanocomposites in order to understand the factors which lead to the desired dispersion of nanoclay in the polymer matrix. School of civil environmental and chemical engineering college of science engineering and health rmit university march 2015. Mechanical and surface properties of lowdensity polyethylene film.
High density polyethylene composites reinforced with. Pdf mechanical properties of high density polyethylenemodified. Tensile and hydrostatic pressure tests are performed on unwelded and welded pipes for high density polyethylene pipes. Considerations concerning the influence of these parameters on hdpe mechanical strength properties as a result of the predominance of oxidative degradation or of crosslinking are presented. Hdpe high density polyethylene after its experimental preparation in the 1930s, the application in high frequency radar cables during world war ii, gave impetus to its commercial production. High density polyethylene composites reinforced with hybrid. Conversely, resins with a relatively high molecular weight will yield a lower melt index. Mechanical properties of high density polyethylenecement.
Mechanical and thermal properties of rhigh density. It is a thermoplastic with a very high strength to density ratio. The filler varied from 5% to 25% by weight in the composite. Several published models were adapted to fit the measured tensile modulus and strength of various composite systems. The samples used in this work were prepared through melt compounding, using high density polyethylene and organomodified clay of. Although the density of hdpe is only marginally higher than that of low density polyethylene, hdpe has little branching, giving it stronger intermolecular forces and tensile strength than ldpe. Properties with values for just one material 19, in this case are not shown. Hdpechitosan blends modified with organobentonite synthesized. It has been used in recent years for garden furniture as it resists the weather and can be cleaned very easily. The milk jugs are the resin type of highest value and greatest mechanical properties.
Low density polyethylene ldpe high degree of short and long chain branching density 30. The features of the stressstrain curves obtained are discussed. High density polyethylene hdpe sheet this sheet can be heat formed, shaped, and welded to fabricate ducts, hoods, and much more. Thermomechanical properties of high density polyethylene. It may be used as a generalpurpose blow molding resin or sheet extrusion thermoforming resin. The process and the properties of the materials make all the difference, however, the proof is most evident in the quality of the end product.
History and physical chemistry of hdpe plastics pipe institute. Mechanical properties value unit dineniso tensile strength at yield 25 mpa 527d638 elongation at yield 9 % 527 modulus of elasticity in tension mpa 527d638 modulus of elasticity in flexure 1400 mpa 178d 790. Hdpe is a very versatile plastic that has a wide range of applications from pipes to storage bottles. For each property being compared, the top bar is hdpe and the bottom bar is ldpe. High density polyethylene hdpe foams of four different molecular weight were used to study the effect of molecular weight and foam density on mechanical properties during tension and at the. The effect of individual and combined particleboard dust pb dust and basalt fibers bfs on mechanical and thermal expansion performance of the filled virgin and recycled high density polyethylene hdpe composites was studied. Mechanical properties of blend of high density polyethylene hdpe and low density polyethylene ldpe have been investigated. Abbas hassan kadhim lecturer, university of kufa, faculty administration and economics college, iraq. It has a high degree of short and long chain branching, which means that the chains do not pack into the crystal structure as well. Hdpe materials inventor autodesk knowledge network.
Study of physiomechanical properties of high density. Invariant dielectric strength upon addition of low amounts of hdpe. The excellent physical and mechanical properties provide the wide range of applications of this polymer. Each property range of values reported is minimum and maximum values of appropriate matweb entries. High density polyethylene is harder than low density polyethylene and has higher tensile strength, and better compressive strength. A common steel used widely in school workshops and in the construction and manufacturing industries.
Hdpe has good insulation properties and is easy to weld. High density polyethene hdpe is a class of polymer that was only utilized in the production of domestic article. Ldpe low density polyethylene is defined by a density range of 0. Why is high density polyethylene suitable for the manufacture of outdoor recycling bins. Rheological and mechanical properties of ultrahigh molecular. Results of experimental investigation of mechanical properties of high density polyethylene hdpechlorinated polyethylene cpe blends in tension are reported. A considerable improvement on mechanical properties of the material can be observed when the volume fraction of cnt is increased. The mechanical properties of binary blends of high. Pdf high density polyethylene hdpecalcium silicate cs composites containing vinyltriethoxysilane treated calcium silicate contents varying from. For some applications, such as pipes and fittings for liquids or gases transportation, the longterm creep mechanical response is one of the most important. High density polyethylene hdpe representing the largest portion of the polyethylene applications, hdpe offers excellent impact resistance, light weight, low moisture absorption, and high tensile strength. The effect of polyethylene glycol peg and highdensity polyethylene hdpe on the.
This was as a result of its poor physio mechanical properties. Effects of microstructure on creep characteristics, authorj. Polyethylene is a whitish, semicrystalline, and effectively opaque engineering thermoplastic which, chemically, is a very high molecular weight 36 million hdpe. The purpose of this study is to increase knowledge of electrofusion and butt fusion welding methods and examine them in order to establish which offers the best performance for a specific engineering service project.
Hdpe is used to make bottles for fruit juice, milk, water, kitchen cleansing products and even furniture. Particle size distribution of various grades of fly ash and the various mechanical properties of the composites prepared are discussed below. High density polyethylene has good chemical resistance and electrical properties, but it has a high thermal expansion and tends to fail under mechanical and thermal stress. Pdf mechanical properties of high density polyethylene. It has therefore less strong intermolecular forces as the instantaneousdipole induceddipole attraction is less. Mechanical, thermal and crystallization properties of. The specimens of pure hdpe, cpe, and nine types of hdpecpe blends, with different component ratios at 10 wt.
For more specific values, follow the links immediately below. Thermal and mechanical properties of recycled high density. The latter, were achieved through the injection molding of high density polyethylene hdpe reinforced with specific volume fraction of cnts. Mechanical properties of high density polyethylene. Of the three types of polyethylene specimens, high density polyethylene recorded an excellent performance in terms of yield behaviour, absorbed energy, stiffness, and strength properties than that. Effects of microstructure on creep characteristics by joy j. The comments report the average value, and number of data points used to calculate the average. Hdpe is primarily used for woodplastic composites such as plastic lumber. High density polyethylene hdpe is a longchain polymer or plastic. The chemical properties of polyethylene foam are similar to that of paraffin. I56ce111922007 a thesis submitted in partial fulfillment of the requirements for the award of the degree of master of science in the school of pure and applied sciences of kenyatta university december, 2012.
Mol petrochemicals unimodal medium and high density tipelin grades mdpe and hdpe are produced by continuous suspension polymerization using low pressure catalytic process under licence of phillips petroleum co. Thus obtained hdpecs composites were characterized by the thermal analyses. Mechanical properties of high density polyethylenecarbon nanotube composites. High density polyethylene structure, properties, and uses. Pdf mechanical properties of highdensity polyethylene. Us5153039a high density polyethylene article with oxygen. High density polyethylene hdpe resin designed for blow molding applications formolene hb5502b is designed for applications requiring excellent stiffness and stress crack resistance properties. These species can combine with oxygen from air to generate polar groups, such as.
It is a product of indorama group, a subsidiary of eleme petrochemical company ltd nigeria. Highdensity polyethylene definition of highdensity. The matrix used in the study was recycled high density polyethylene rhdpe. It was shown that the use of silanemodified gfs had a much larger effect in improving mechanical properties and in. The density of hdpe can range from 930 to 970 kgm 3. Mechanical properties of electro and butt fusion welded. In contrast to other materials, polyolefins combine several ecological and economical benefits. High density polyethylene physical properties metric english comments specific gravity 0.
This property data is a summary of similar materials in the matweb database for the category high density polyethylene hdpe, extruded. It was found that the incorporation of the calcium silicate into high density polyethylene resulted in a slight increase in the yield stress 6. High density polyethylene americas leading plastics. In burning, polyethylene resins contribute high heat and may generate a dense black smoke. Cheng a thesis presented to the university of waterloo. Glass reinforcement improves its thermal expansion, strength, rigidity and temperature resistance. From this pointofview, new applications could also be seen in areas with service temperatures. It was shown that the use of pb dust had a positive effect on improving mechanical properties and on reducing linear coefficient of thermal expansion lcte values of. Density mechanical properties tensile strength md td tensile strain at break md. Water absorption and mechanical properties of the composite material based on high density polyethylene resin were investigated. The rationale of usingrhdpe is to achieve solid waste reduction and further develop sustainable materials. Mechanical properties of high density polyethylenemodified. Mechanical properties of filled high density polyethylene. High density polyethylene hdpe is stronger than low density polyethylene ldpe.
Because of its combination of low cost, high chemical resistance, and well balanced mechanical properties, high density polyethylene hdpe is one of the most widely used thermoplastics. Typical engineering properties of high density polyethylene. Astm d5702 mechanical properties hardness, shore d 70 70 astm d2240. Write a couple of sentences on hdpe using each of the keywords listed above. Hdpe technical data high density polyethylene, shore d hardness, physical properties, mechanical properties, electrical properties, thermal properties. Hdpe is manufactured at low temperatures and pressures, using zieglernatta and metallocene catalysts or activated chromium oxide known as a phillips catalyst.
The experimental results show an improvement of hdpe. High density polyethylene resin was reinforced with 5, 10, 15, 20 and 25% by weight ferric chloride. Improving the design stresses of high density polyethylene pipes and vessels used in reverse osmosis desalination plants. Hdpe is a boon to developing countries like india where it is used to prevent groundwater. Highdensity polyethylene hdpe is the most common household packaging material due to its low resin cost and. High density polyethylene, often abbreviated to hdpe, is a polymer whose monomer is ethylene. Hdpe is a cost effective material for both indoor and outdoor applications. Filled thermoplastics have been used widely as independent shell layer for coextruded nfpc with coreshell structure. This thermoplastic is available in a range of flexibilities depending on the production process. Ignition temperature cloud 790 f 420 c minimum radiant flux for ignition 20 kwm2. The property relationships observed depend strongly on the process used to fabricate the blends as shown by comparisons of specimens made by injection and compression molding. The melting point of high density polyethylene ranges between 120 to 180 degrees celsius, however thermal properties vary with the type of polyethylene used. The properties of hdpe include three common variations.
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