Effect of temperature ? Time factors on the yield point of crystalline polymers in the flat stressed state (high-density polyethylene)

1977 ◽  
Vol 13 (2) ◽  
pp. 226-232
Author(s):  
A. Ya. Gol'dman ◽  
A. M. Grinman
Keyword(s):  
Stressed State ◽  
Yield Point ◽  
High Density Polyethylene ◽  
Time Factors ◽  
High Density ◽  
Effect Of Temperature ◽  
Crystalline Polymers ◽  
Temperature Time

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.

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

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.

Update to “Effect of Temperature and Vapor Residence Time on the Micropyrolysis Products of Waste High Density Polyethylene”

2020 ◽  
Vol 59 (22) ◽  
pp. 10716-10719 ◽  
Author(s):  
Justin M. Russell ◽  
Ulises R. Gracida-Alvarez ◽  
Olumide Winjobi ◽  
David R. Shonnard
Keyword(s):  
Residence Time ◽  
High Density Polyethylene ◽  
High Density ◽  
Effect Of Temperature

The effect of temperature and annealing on the phase composition, molecular mobility and the thickness of domains in high-density polyethylene

Polymer ◽  
2007 ◽  
Vol 48 (3) ◽  
pp. 763-777 ◽  
Author(s):  
Cristian Hedesiu ◽  
Dan E. Demco ◽  
Ralph Kleppinger ◽  
Alina Adams Buda ◽  
Bernhard Blümich ◽  
...  
Keyword(s):  
Phase Composition ◽  
Molecular Mobility ◽  
High Density Polyethylene ◽  
High Density ◽  
Effect Of Temperature
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