Fine-structure and physical properties of polyethylene fibers in high-speed spinning. I. Effect of melt-flow rate in the high-density polyethylene

The aim of the paper was to discover the influence of modifying HDPE with selected agents that is a blowing agent, in the course of the extrusion process, inclusive of determination how the modification affects selected physical properties and properties of the surface of HDPE extrusion product. Endothermic chemical blowing agents in the amount of 0.6 % by mass were used in the research. The article presents selected results of examination of melt flow rate (MFR) and microscopic structure.

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Fine structure and physical properties of polyethylene fibers in high-speed spinning. II. Effect of catalyst systems in linear low-density polyethylene

Journal of Applied Polymer Science ◽

10.1002/1097-4628(20000808)77:6<1195::aid-app4>3.0.co;2-q ◽

2000 ◽

Vol 77 (6) ◽

pp. 1195-1206 ◽

Cited By ~ 1

Author(s):

H. H. Cho ◽

K. H. Kim ◽

H. Ito ◽

T. Kikutani

Keyword(s):

Fine Structure ◽

Physical Properties ◽

High Speed ◽

Low Density Polyethylene ◽

Low Density ◽

Linear Low Density Polyethylene ◽

Catalyst Systems ◽

Polyethylene Fibers

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An Experimental Study on the Properties of Recycled High-Density Polyethylene

International Polymer Processing ◽

10.1515/ipp-2020-4071 ◽

2021 ◽

Vol 36 (5) ◽

pp. 557-563

Author(s):

A. G. Toroslu

Keyword(s):

Physical Properties ◽

High Density Polyethylene ◽

Iron Alloy ◽

High Density ◽

Magnetic Method ◽

Metallic Materials ◽

Metallic Material ◽

Alloy Particles ◽

Plastic Materials ◽

Mechanical And Physical Properties

Abstract Recycling of plastic materials has become more environmentally important than recycling of other materials. The most important problem during recycling is the presence of oil, dirt, dust and metal particles that are mixed with plastic materials. These mixtures can change their its mechanical and physical properties and it is quite costly to remove them completely. Removing iron alloy particles from plastic is possible by using the magnetic method. However, removing non-metallic materials requires extra processing. In this study, the use of recycled High-Density Polyethylene (rHDPE) without an expensive cleaning processes has been investigated. Different amounts of aluminium oxide (Al2O3) were added to High Density Polyethylene (HDPE) to simulate the effect of non-metallic material involved. The effect of these contamination rates on the mechanical and physical properties of HDPE was examined in detail. For this purpose, recyclable materials were produced by mixing rHDPE with 1%, to 7% Al2O3 . The results show that up to 7% of the mixture has acceptable effects on the properties of HDPE. When the results of the experiments are examined, it is observed that there is a 3.74% change in the elastic modulus of the material. This means, that up to 7% non-metal contaminated rHDPE material can be used without any costly recycling process.

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Fine structure formation and physical properties of poly(butylene terephthalate) fibres in high-speed melt spinning

e-Polymers ◽

10.1515/epoly.2003.3.1.353 ◽

2003 ◽

Vol 3 (1) ◽

Cited By ~ 2

Author(s):

Hee Lee Sun ◽

Hou Kim Kyoung ◽

Kikutani Takeshi ◽

Hok Cho Hyun

Keyword(s):

Fine Structure ◽

Physical Properties ◽

Structure Formation ◽

High Speed ◽

Melt Spinning ◽

Mechanical Analysis ◽

Scanning Calorimetry ◽

Butylene Terephthalate ◽

Initial Modulus ◽

Higher Temperature

Abstract Poly(butylene terephthalate) (PBT) fibres were obtained by high-speed melt spinning up to a take-up velocity of 8 km/min. Fine structure formation and physical properties of these fibres were investigated. The increase of take-up velocity caused raises in both density and birefringence. In wide-angle X-ray diffraction equatorial profiles, the increase of take-up velocity can be observed in the (010) and (100) reflections of β-crystals; the reflection peaks are the sharpest at a take-up velocity of 6 km/min. The initial modulus of the fibres arises when the fraction of β-crystals is increased, while the tenacity depends more on the fraction of α-crystals, i.e., the total crystallinity. Thermal properties of high-speed spun PBT fibres were measured with differential scanning calorimetry, dynamic mechanical and thermo-mechanical analysis, etc. Endothermic curves become sharper with increasing take-up velocity, and endothermic melting peaks are shifted to higher temperature. Crystal structures are well developed in fibres obtained at higher take-up velocities. The tan δ peaks of PBT fibres tend to shift to higher temperature and the peak intensity is decreased with increasing take-up velocity, i.e., the packing density of PBT fibres is high when the take-up velocity and thus the orientation of amorphous regions is increased. The shrinkage has a tendency to decrease with increasing take-up velocity.

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Influence of additives on some physical properties of high density polyethylene-II. commercial u.v. stabilizers

European Polymer Journal ◽

10.1016/0014-3057(87)90184-4 ◽

1987 ◽

Vol 23 (9) ◽

pp. 729-732 ◽

Cited By ~ 5

Author(s):

Alfonso J. Chirinos Padrón ◽

Zimbul Rubinztain ◽

Maria A. Colmenares

Keyword(s):

Physical Properties ◽

High Density Polyethylene ◽

High Density

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Estimating crystallinity in high density polyethylene fibers using online Raman spectroscopy

Journal of Applied Polymer Science ◽

10.1002/app.11719 ◽

2003 ◽

Vol 88 (2) ◽

pp. 545-549 ◽

Cited By ~ 32

Author(s):

R. P. Paradkar ◽

S. S. Sakhalkar ◽

X. He ◽

M. S. Ellison

Keyword(s):

Raman Spectroscopy ◽

High Density Polyethylene ◽

High Density ◽

Polyethylene Fibers

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Effect of Powder Properties such as Particle Size, Density and Melt Flow Rate on the Properties of Flame Sprayed PE Coating

Thermal Spray 2000: Proceedings from the International Thermal Spray Conference ◽

10.31399/asm.cp.itsc2000p0281 ◽

2000 ◽

Author(s):

E. Rajamäki ◽

M. Leino ◽

P. Vuoristo ◽

P. Järvelä ◽

T. Mäntylä

Keyword(s):

Mechanical Properties ◽

Particle Size ◽

Flow Rate ◽

Heating Temperature ◽

Steel Substrate ◽

Great Influence ◽

Hot Water ◽

Melt Flow ◽

Melt Flow Rate ◽

Powder Properties

Abstract Three different types of polyethylene powders were flame sprayed onto pre-heated steel substrate previously coated by electrostatic spray system with a thin epoxy primer layer. Properties of the polyethylene (PE) powders, including powder density, particle size and melt flow rate (MFR) were measured in order to study their influence on the mechanical properties of the coating. The spray experiments started with optimization of spraying parameters. The main variables were pre-heating temperature of the substrate, temperature increase during spraying (influenced by the spraying distance), and thickness of the PE coatings. The laboratory tests performed for the coatings were coating characterization by microscopy and mechanical testing. Porosity and thickness of the coatings were determined by optical and stereo microscopy studies from polished cross-sectional samples. Hardness, impact strength, peel strength, and adhesive strength of the coatings were also investigated. Also some hot water sinking and heat cycling tests were performed. As a result from the present studies it can be concluded that powder properties have great influence on the mechanical properties of the final coating.

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Sepiolite as a nanofiller to improve mechanical and thermal behavior of recycled high-density polyethylene

Progress in Rubber Plastics and Recycling Technology ◽

10.1177/1477760620918596 ◽

2020 ◽

Vol 36 (3) ◽

pp. 185-195 ◽

Cited By ~ 1

Author(s):

Negin Farshchi ◽

Yalda K Ostad

Keyword(s):

Thermal Behavior ◽

High Density Polyethylene ◽

Low Cost ◽

Process Condition ◽

Softening Temperature ◽

High Density ◽

Plastic Pollution ◽

Scanning Calorimetry ◽

Melt Flow Rate ◽

Recycled Hdpe

Regarding the current demand for controlling plastic pollution, recycling of polymer sounds a promising solution. However, recycling causes mechanical and thermal shortcomings in polymers. Addition of nanoparticles to recycled materials may overcome these shortcomings. Nanocomposites can be achieved either by blending or through polymerization. Sepiolite as a nanoparticle enhances the thermal properties of polymers. In this study, the effect of sepiolite as a nanoparticle has been investigated on the thermal and mechanical behavior of recycled high-density polyethylene (HDPE). Hardness, density, Vicat softening temperature, melt flow rate (MFR), and differential scanning calorimetry has been investigated on recycled HDPE containing different amount of sepiolite. Results showed that both the amount of recycled HDPE and the sepiolite content affect the mechanical and thermal behavior of samples. Increasing the amount of recycled component resulted in increasing of MFR, a slight increase in density, and decrease in Vicat softening point, hardness, melting temperature, and degree of crystallization. As an opposite effect of these to factors on crystallinity of HDPE, sepiolite content has better effects to be considered separately for each recycle content. Sepiolite can be introduced as a low-cost reinforcement filler in recycling industry for tuning new compositions based on process condition, or vice versa.

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