Binary Interactions between High-Density Polyethylene and 4-(1-Naphthylmethyl)bibenzyl during Low-Pressure Pyrolysis

2000 ◽  
Vol 14 (2) ◽  
pp. 448-458 ◽  
Author(s):  
Matthew J. De Witt ◽  
Linda J. Broadbelt
Keyword(s):  
High Density Polyethylene ◽  
Low Pressure ◽  
High Density

scholarly journals Low pressure shock response and dynamic failure of high density polyethylene (HDPE)

2018 ◽  
Author(s):  
Jennifer L. Jordan ◽  
Dana M. Dattelbaum ◽  
Benjamin F. Schilling ◽  
Cynthia F. Welch ◽  
Jamie A. Stull
Keyword(s):  
High Density Polyethylene ◽  
Low Pressure ◽  
High Density ◽  
Dynamic Failure ◽  
Pressure Shock ◽  
Shock Response

Pressure Effects on the Lifetime of Gas High Density Polyethylene Pipes

2021 ◽  
Author(s):  
Yang Wang ◽  
Hui-qing Lan ◽  
Tao Meng ◽  
Bing Wang ◽  
Du du Guo ◽  
...  
Keyword(s):  
Natural Gas ◽  
Induction Time ◽  
High Density Polyethylene ◽  
Reaction Rate ◽  
Low Pressure ◽  
Gas Pressure ◽  
High Density ◽  
Pressure Effects ◽  
Polyethylene Pipes ◽  
Hdpe Pipes

Abstract The purpose of this study was to propose low gas pressure effects on lifetime of natural gas high density polyethylene (HDPE) pipes by thermal-oxidative aging (TOA). The new method to assess the lifetime of HDPE natural gas pipes is based on gas pressure testing. An approach to monitor oxidative induction time (OIT) has been used to predict lifetime. Natural gas HDPE pipes were used to evaluate the effects of low gas pres-sures on oxidative induction time. In order to emphasize the pressure effects, relatively low temperatures at 45, 55, 65 and 75 °C were utilized for the exposure. The low-pressure conditions were created using air at levels of 0, 0.1, 0.2, 0.3 and 0.4 MPa. The property of high density polyethylene pipes was effectively moni-tored using the low pressure oxidative induction time (OIT) test. The results show that the aging reaction rate of high density polyethylene pipes increased exponentially with temperature and gas pressure according to the Arrhenius equation. Analytical models were developed to predict the aging reaction rate and lifetime of natural gas HDPE pipes.

Characterization of high-density polyethylene prepared at low pressure

1972 ◽  
Vol 16 (9) ◽  
pp. 2353-2359
Author(s):  
K. Hara ◽  
T. K. Kwei ◽  
H. Schonhorn
Keyword(s):  
High Density Polyethylene ◽  
Low Pressure ◽  
High Density

COMPARISON OF OPTIONS FOR CALCULATING OF LOW PRESSURE POLYETHYLENE RECTANGULAR TANKS WITH STEEL TANKS OF IDENTICAL SIZE

2017 ◽  
Vol 7 (1) ◽  
pp. 36-40
Author(s):  
Andrey V. SHAYKHISLAMOV ◽  
Alexander V. BALOBANOV ◽  
Ilya A. PORYVAEV
Keyword(s):  
High Density Polyethylene ◽  
Software Package ◽  
Low Pressure ◽  
High Density ◽  
Rectangular Tank ◽  
Steel Tanks

The results of the calculation of a rectangular tank from lowpressure polyethylene with steel reinforcements calculated in the software package SCAD Offi ce based on previously performed manual and test calculations are presented. The topicality of this research for the specifi c purposes of considered structures use is substantiated. To confi rm the technical advantages of the proposed structures calculations of economic benefi t when using rectangular tanks of high-density polyethylene instead of steel tanks with steel reinforcements of identical size and volume are made.

Composition and Surface Topography Effects on Apatite-Forming Ability of Ceramic-Polymer Composites

2003 ◽  
Vol 774 ◽  
Author(s):  
Susan M. Rea ◽  
Serena M. Best ◽  
William Bonfield
Keyword(s):  
Surface Topography ◽  
High Density Polyethylene ◽  
High Density ◽  
Apatite Layer ◽  
Biologically Active ◽  
Human Blood Plasma ◽  
Apatite Formation ◽  
Polyethylene Matrix ◽  
Composite Surface ◽  
X Ray

AbstractHAPEXTM (40 vol% hydroxyapatite in a high-density polyethylene matrix) and AWPEX (40 vol% apatite-wollastonite glass ceramic in a high density polyethylene matrix) are composites designed to provide bioactivity and to match the mechanical properties of human cortical bone. HAPEXTM has had clinical success in middle ear and orbital implants, and there is great potential for further orthopaedic applications of these materials. However, more detailed in vitro investigations must be performed to better understand the biological interactions of the composites and so the bioactivity of each material was assessed in this study. Specifically, the effects of controlled surface topography and ceramic filler composition on apatite layer formation in acellular simulated body fluid (SBF) with ion concentration similar to those of human blood plasma were examined. Samples were prepared as 1 cm × 1 cm × 1 mm tiles with polished, roughened, or parallel-grooved surface finishes, and were incubated in 20 ml of SBF at 36.5 °C for 1, 3, 7, or 14 days. The formation of a biologically active apatite layer on the composite surface after immersion was demonstrated by thin-film x-ray diffraction (TF-XRD), environmental scanning electron microscopy (ESEM) imaging and energy dispersive x-ray (EDX) analysis. Variations in sample weight and solution pH over the period of incubation were also recorded. Significant differences were found between the two materials tested, with greater bioactivity in AWPEX than HAPEXTM overall. Results also indicate that within each material the surface topography is highly important, with rougher samples correlated to earlier apatite formation.

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