Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : HDPE

Comparison OF Shear Properties for High Density Polyethylene (HDPE) and Poly vinyl Cloride (PVC) Polymers

Shawnim R. Jalal; Delven kareem

Engineering and Technology Journal, 2015, Volume 33, Issue 9, Pages 2039-2048

The properties that make plastic of direct interest to designers and engineers are its good strength to weight ratio, low manufacturing installation costs, and high durability. The strength of polymers is known to be sensitive to temperature and this generally limits their use under service temperatures. The present work addresses the effect of temperatures ranging from 0 to 70 on the shear properties of high-density polyethylene (HDPE) and polyvinyl chloride (PVC) materials. The results show that Yield stress increase with temperature by (15.4%) for HDPE and the temperature has no effect on yield stresses of PVC.
The modulus of elasticity varied in each temperature for both materials selected and the maximum shear strength, however, showed a slight increase in this temperature range by (1.4%) for HDPE but slightly decrease by (2%) for PVC. Shear rupture and elongation reduced by (0.02%) with increasing temperature by (1 °C) for both materials .Ductile fracture is observed to be the controlling failure mechanism at all temperatures of interest for both material and no data were recorded at 70 due to distortion of all specimens in this temperature selected.

Comparative Study of Some Properties of Two Groups’ Binary Polymer Blends Prepared By a Twin-Screw Extruder

Sihama I. Al-Shalchy; Kadhum M. Shabeeb; Rula F. Hasan

Engineering and Technology Journal, 2015, Volume 33, Issue 8, Pages 1971-1985

In this paper, the preparation and compare of some mechanical and physical properties of two groups of polymer blends consisting of polyvinyl chloride with polypropylene (PP-PVC) and poly-vinyl chloride with high-density polyethylene (HDPE-PVC). Using a twin-screw extruder, three weight percentages of PP and HDPE (5, 10 and 15%) were used to prepare the polymer blends. Experimental investigation was carried out for analyzing the mechanical properties liketensile strength, flexural strength, compression, impact, and hardnessand physical properties (thermal characteristics and melt flow index) for the polymer blend samples. The results show that the polymer blend (HDPE-PVC) get higher values than polymer blend (PP-PVC) in fracture strength, young´s modulus, elongation, flexural strength, creep resistantand maximum shear stress and thermal characteristics, whereas the polymer blends (PP-PVC) get higher values in impact strength, fracture toughness, hardnessand compression and melt flow index. Besides, the increment in PP or HDPE content weak the properties of the polymer blends and the samples with (5%PP:95%PVC) and (5%HDPE:95%PVC)were the best among the other polymer blends samples.

Water Absorption of HDPE/Al2O3,TiO2 Composites

Harith I. Jaffer; Z. R. Al-Shammary; Ali A. Abbas; Ali Qassim

Engineering and Technology Journal, 2015, Volume 33, Issue 7, Pages 1337-1347

The water absorption of high density polyethylene filled with micro hybrid (titanium dioxide and alumina), alumina and titanium dioxide with weight ratio of 15%, 20%, 25% and 30% , are measured in order to study the effect of these particles on water absorption of this polymer. The result shows that the increase of content of filler particles increasing water absorption, because of filler particles which have a higher water absorption percentage than the matrix material, and the filler will take up the free volume within the polymer matrix and create a tortuous path for the water permeating through the sample.

Mechanical and Morphological Properties of HDPE: PP and LDPE: PP Polymer Blend Composites Reinforced with TiO2 particles

Sihama I. Salih; Abdullkhaliq F.hamood; Alyaa H. Abdalsalam

Engineering and Technology Journal, 2013, Volume 31, Issue 12, Pages 2211-2227

In this research two groups of polymer blends have been prepared First group included (High density polyethylene (HDPE): Polypropylene (PP))While the Second group(included Low density polyethylene (LDPE): Polypropylene (PP)) both groups prepared withpolypropylene of (20% and 80%). From the results of tensile test for the prepared blends it has been showed that the optimum blending ratio was (20%LDPE:80%PP and 20%HDPE:80%PP) which thenreinforced with (2, 5 and 8wt%) oftitanium dioxide (TiO2), particle size (0.421μm). Titaniaparticles were
mechanically mixed with the polymers prior tomelt mixing for better dispersion.
Polymerblend composites were obtained by using single screw extruder. Results showed that mechanical properties increased as titania content increased except elongation.Furthermore the result recorded highest values ofimpact strength and fracture toughness at2%wt TiO2which is 312 Mpa and 572.8Mparespectively,for the polymer blend (20%HDPE: 80%PP) composite and for the polymer blend (20%LDPE: 80%PP) composites the impact strength and fracture toughness are 262.5Mpa and 468 Mpa respectively.The mechanical properties values of 20%HDPE: 80%PP is higher than 20%LDPE: 80%PP polymer blendcomposites. Scanning
electron microscopy (SEM) imagesshowed that there isbonding developed between TiO2 and polymer blends in some regions.

Studing Of Some Phisical Properties And Morphology Of Blends Of Hdpe /Lldpe After And Before Exposure To Uv Light

Najat J. Saleh; Nabeela A. Mohammed; Weam A. Abed

Engineering and Technology Journal, 2009, Volume 27, Issue 4, Pages 820-830

Products made of polyethylene used out doors are subjected to UV-degradation. In
fact, many polymers show changes in physical properties during service lifetime, when
they are exposed to sun light and particularity to UV-light. In the present work, the
physical properties and the morphology of blends of high – density polyethylene
(HDPE)/linear-low-density polyethylene (LLDPE) studied before and after exposure to
UV –light.
HDPE was mixed with different weight percent (0, 15, 30, and 45%) of LLDPE using
the two roll mills; the mixing machine is operated at a temperature of 135 oC.
Weathering test was carried out to find the effect of the environment condition on the
physical properties of the polymeric materials by increasing the exposure times to
(100,200,300) hr. The physical properties and the morphology were specified by
measuring the (absorption properties, and densities), for the former, and
photomicrograph for the latter. The results obtained in this work show that the density of
pure HDPE and HDPE/LLDPE blends increased with the increasing the exposure time,
and that immersing the HDPE and HDPE/LLDPE blends in water can produce a variety
of damage and this damage increased with the increasing of the exposure times also, as
the amount of LLDPE is increased in the HDPE/LLDPE blends the amount of water
absorbed and diffusivity coefficient, increase greatly, and from the optical micrograph
results showed clearly the damage obtained due to exposure to UV light for 300 hr for
pure HDPE and HDPE/LLDPE blends.

The Effect Of Blending Of Linear Low –Density Polyethylene On Mechanical Properties Of High Density – Polyethylene

Nabeela A. Mohammed; Najat J.Saleh

Engineering and Technology Journal, 2009, Volume 27, Issue 3, Pages 418-424

High – density polyethylene is an important commercial polymer and it is widely
used for different engineering applications. In the present work, polymer blends were
fabricated by mixing two types of polyethylene, high – density polyethylene was mixed
with different weight percent of linear – low – density polyethylene using two – roll
mill, the mixing machine was operated at a temperature of 135oC.
A series of standard tests (destructive), tensile, impact, hardness, and compression
were carried out on the prepared samples it was found that the addition of linear – low –
density polyethylene to the high – density polyethylene leads to decrease in the modulus
of elasticity, tensile strength, tensile strength at break and increase in the % elongation at
For the impact test it was found that the addition of linear – low – density
polyethylene caused an increase in the impact strength of the material, the polymer blend
with 45 % wt of linear – low – density polyethylene gave the highest value of impact
On the other hand the hardness test was carried out and it was found that the addition
of linear – low – density polyethylene leads to decrease the hardness of the polymer
blends. Therefore, the neat high – density polyethylene gave the highest hardness value.