scholarly journals Synthesis of Carbon Nanotubes from High-Density Polyethylene Waste

2019 ◽  
Vol 21 (3) ◽  
pp. 241 ◽  
Author(s):  
G.T. Smagulova ◽  
N. Vassilyeva ◽  
B.B. Kaidar ◽  
N. Yesbolov ◽  
N.G. Prikhodko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Decomposition ◽  
High Density Polyethylene ◽  
Power Plants ◽  
Thermal Power ◽  
High Density ◽  
Effect Of Temperature ◽  
Decomposition Products ◽  
Turbostratic Carbon ◽  
Synthesis Of Carbon Nanotubes

This article presents results of carbon nanotubes synthesis from household high-density polyethylene waste by thermal decomposition. A specific feature of this work is that the decomposition of high-density polyethylene waste and synthesis of carbon nanotubes were carried out in one-step using three-zone chemical vapor deposition reactor. The effect of temperature in the range of 450‒550 °C on decomposition products of high-density polyethylene was investigated. The decomposition products of polyethylene wastes were investigated by IR Fourier spectroscopy. Cenospheres obtained from ash and slag waste from thermal power plants during coal combustion were used as a catalyst for the synthesis of carbon nanotubes. The cenospheres were impregnated with an aqueous solution of iron nitrate. It was found that as a result of thermal decomposition of high-density polyethylene waste at temperature of 450 °C, gaseous carbon-containing compounds are formed, which upon further heating to 800 °C lead to the formation of carbon nanotubes with a diameter of 16‒21 nm on the surface of catalyst. Physicochemical analysis showed that turbostratic carbon is almost completely absent in the formed product. Carbon nanotubes analysis was performed by scanning electron microscopy and Raman spectroscopy.

Enhanced dispersion of carbon nanotubes in high density polyethylene matrix using secondary nanofiller and compatibilizer

2015 ◽  
Vol 16 (1) ◽  
pp. 129-137 ◽  
Author(s):  
M. E. Ali Mohsin ◽  
Agus Arsad ◽  
Syed K. H. Gulrez ◽  
Zurina Muhamad ◽  
H. Fouad ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Density Polyethylene ◽  
High Density ◽  
Polyethylene Matrix

Influence of Heating Rates On the Toxicity of Evolved Combustion Products: Results and a System for Research

1983 ◽  
Vol 1 (6) ◽  
pp. 465-479 ◽  
Author(s):  
Shayne Cox Gad ◽  
Ann C. Smith
Keyword(s):  
Decomposition Rate ◽  
High Density Polyethylene ◽  
Combustion Products ◽  
Douglas Fir ◽  
High Density ◽  
Heating Rates ◽  
Decomposition Products ◽  
Sample Heating ◽  
Rate Of Heating

The significance of the rate of heating of materials to the nature and toxi cologic consequences of combustion products formed by natural and man-made products was evaluated using a system designed to allow exact control and reproducibility of this variable. Using this system, the decomposition products of Douglas Fir, Hem Fir, and a high density polyethylene were characterized in terms of gases evolved, lethality, and ability to incapacitate at sample heating rates of 20, 30, 40, and 50 °C per minute. For all three materials, the rate of heating was found to have marked influences on both the decomposition prod ucts and their toxicologic impact. This influence was not such as to be ex plainable as just a decomposition rate phenomenon.

scholarly journals MECHANICAL CHARACTERIZATION OF PA 12 AND HDPE PIPES BEFORE AND AFTER AGING IN WATER AT TWO DIFFERENT TEMPERATURES

2021 ◽  
Vol 9 (1) ◽  
pp. 248-256
Author(s):  
J.A. dos Santos ◽  
R.C. Tucunduva ◽  
J.R.M. D’Almeida
Keyword(s):  
High Density Polyethylene ◽  
Mechanical Performance ◽  
High Density ◽  
Effect Of Temperature ◽  
Polyamide 12 ◽  
Polyethylene Pipes ◽  
Before And After ◽  
Different Temperatures ◽  
Deterioration Process ◽  
Combined Action

Polymer pipes are being widely used by many industrial segments. Although not affected by corrosion, the mechanical performance of these pipes can be reduced due to exposure to temperature, UV radiation and by contact with various fluids. Depending on the deterioration process, embrittlement or plasticization may occur, and the service life of the pipe can be severely reduced. In this work, the combined action of temperature and water upon the mechanical performance of polyamide 12 and high-density polyethylene pipes is evaluated. Destructive and non-destructive techniques were used and the performance of both materials was compared. Both polymers were platicized by the effect of water. However, for high density polyethylene the effect of temperature was more relevant than for polyamide. This behavior was attributed to the dependence of the free volume with the markedly different glass transition temperature of the polymers and the temperatures of testing.

scholarly journals Effect of Temperature on Pyrolysis Oil Using High-Density Polyethylene and Polyethylene Terephthalate Sources From Mobile Pyrolysis Plant

2020 ◽  
Vol 8 ◽  
Author(s):  
Ruktai Prurapark ◽  
Kittwat Owjaraen ◽  
Bordin Saengphrom ◽  
Inpitcha Limthongtip ◽  
Nopparat Tongam
Keyword(s):  
Polyethylene Terephthalate ◽  
High Density Polyethylene ◽  
Main Product ◽  
Carbon Number ◽  
High Density ◽  
Raw Material ◽  
Effect Of Temperature ◽  
Pyrolysis Oil ◽  
Boiling Points ◽  
And Performance

This research aims to study the effect of temperature, collecting time, and condensers on properties of pyrolysis oil. The research was done be analyzing viscosity, density, proportion of pyrolysis products and performance of each condenser towers for the pyrolysis of high-density polyethylene (HDPE) and polyethylene terephthalate (PET) in the mobile pyrolysis plant. Results showed that the main product of HDPE resin was liquid, and the main product of PET resin was solid. Since the pyrolysis of PET results in mostly solid which blocked up the pipe, the analysis of pyrolysis oil would be from the use of HDPE as a raw material. The pyrolysis of HDPE resin in the amount of 100 kg at 400, 425, and 450°C produced the amount of oil 22.5, 27, and 40.5 L, respectively. The study found that 450°C was the temperature that gives the highest amount of pyrolysis oil in the experiment. The viscosity was in the range of 3.287–4.850 cSt. The density was in the range of 0.668–0.740 kg/L. The viscosity and density were increased according to three factors: high pyrolysis temperature, number of condensers and longer sampling time. From the distillation at temperatures below 65, 65–170, 170–250, and above 250°C, all refined products in each temperature range had the carbon number according to their boiling points. The distillation of pyrolysis oil in this experiment provided high amount of kerosene, followed by gasoline and diesel.

Ultrasonic Phased Array: Detection of Detrimental Conditions in High-Density Polyethylene Butt-Fusion Joints

2010 ◽  
Author(s):  
Caleb J. Frederick
Keyword(s):  
High Density Polyethylene ◽  
Nuclear Power ◽  
Power Plants ◽  
Phased Array ◽  
Cold Fusion ◽  
High Density ◽  
Visual Examination ◽  
Full Spectrum ◽  
Ultrasonic Phased Array ◽  
Joint Integrity

Today, commercial nuclear power plants are installing High-Density Polyethylene (HDPE) in non-safety-related and safety-related applications. While this material has numerous advantages over the carbon steel pipes that historically have been used for the same applications, developing a way to accurately inspect for joint integrity in HDPE has become increasingly important to utilities and the U.S. Nuclear Regulatory Commission (USNRC). This paper will investigate the ability to quantify the levels of detection of flaws and detrimental conditions using ultrasonic phased array, in butt-fusion joints throughout the full spectrum of applicable HDPE pipe diameters and wall-thicknesses. Perhaps the most concerning joint condition is that of “Cold Fusion”. A cold-fused joint is created when molecules along the fusion line do not fully entangle or co-crystallize. Once the fusion process is complete, during visual examination, there is the appearance of a good quality joint. However, the joint does not have the strength needed, as the required co-crystallization along the pipe faces has not occurred. Performing a visual examination of the bead, as required by the current revision of ASME Code Case N-755, does not provide adequate guarantee of joint integrity. Therefore, volumetric examination is of special concern to the USNRC to safeguard against this type of detrimental condition. Factors addressed will include pipe diameter, wall-thickness, fusing temperature, interfacial pressure, dwell (open/close) time, and destructive verification of ultrasonic data.

Effect of Temperature and Catalyst Loading on Product Yield in Catalytic Cracking of High Density Polyethylene (HDPE)

2014 ◽  
Vol 49 (6) ◽  
pp. 508-516 ◽  
Author(s):  
Behrooz Roozbehani ◽  
Bagher Anvaripour ◽  
Zahra Maghareh Esfahan ◽  
Mojtaba Mirdrikvand ◽  
Saeedeh Imani Moqadam
Keyword(s):  
Catalytic Cracking ◽  
High Density Polyethylene ◽  
Product Yield ◽  
High Density ◽  
Effect Of Temperature ◽  
Catalyst Loading

Thermal and Morphological Characterization of Nanocomposites Prepared by in-Situ Polymerization of High-Density Polyethylene on Carbon Nanotubes

2007 ◽  
Vol 40 (17) ◽  
pp. 6268-6276 ◽  
Author(s):  
M. Trujillo ◽  
M. L. Arnal ◽  
A. J. Müller ◽  
E. Laredo ◽  
St. Bredeau ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Density Polyethylene ◽  
In Situ Polymerization ◽  
Morphological Characterization ◽  
High Density
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