scholarly journals Improved Processability and the Processing-Structure-Properties Relationship of Ultra-High Molecular Weight Polyethylene via Supercritical Nitrogen and Carbon Dioxide in Injection Molding

Polymers ◽  
2017 ◽  
Vol 10 (1) ◽  
pp. 36 ◽  
Author(s):  
Galip Yilmaz ◽  
Thomas Ellingham ◽  
Lih-Sheng Turng
Keyword(s):  
Carbon Dioxide ◽  
Molecular Weight ◽  
Injection Molding ◽  
High Molecular Weight ◽  
Relationship Of ◽  
Ultra High Molecular Weight ◽  
Structure Properties

scholarly journals Effect of Supercritical Carbon Dioxide on Dyeability and Physical Properties of Ultra-High-Molecular-Weight Polyethylene Fiber

2019 ◽  
Vol 19 (3) ◽  
pp. 228-235 ◽  
Author(s):  
Jaehyuk Ma ◽  
Tarek Abou Elmaaty ◽  
Satoko Okubayashi
Keyword(s):  
Carbon Dioxide ◽  
Molecular Weight ◽  
Supercritical Carbon Dioxide ◽  
High Molecular Weight ◽  
Antimicrobial Property ◽  
Color Measurement ◽  
Conservation Of Energy ◽  
Polyethylene Fiber ◽  
Ultra High Molecular Weight ◽  
Supercritical Carbon

Abstract Supercritical carbon dioxide dyeing, a new type of anhydrous dyeing method, has a lot of advantages, mainly conservation of energy, prevention of pollution, reusability of dye, and many more. This study presents a viable method for the dyeing of an ultra-high-molecular-weight polyethylene (UHMWPE) fabric by using supercritical carbon dioxide (scCO2) as a medium. Five hydrozono propanenitrile dyes that are functional colorants having antibacterial activity were applied for the dyeing of the UHMWPE fabric in scCO2 at a pressure of 20 MPa and at temperature of 120°C. The dyeability of UHMWPE fabric under scCO2 was evaluated by color measurement, whereby the color strength K/S was calculated. As the treating time and concentration of dye increased, the dyeability of the UHMWPE fabric displayed the tendency to continually improve. As decaline was added into scCO2 as the cosolvent, we obtained higher K/S. Furthermore, color fastness to rubbing and sublimation of the dyed UHMWPE fabric were determined according to Japanese Industrial Standards (JIS) L 0849 2 and JIS L 0854, and the trend showed that the increase in fastness corresponded to the increase in duration of the treatment. The influence of scCO2 dyeing on the mechanical properties of UHMWPE was also examined. Consequently, it was found that dyeing in scCO2 containing decaline reduced the crystallinity of the UHMWPE fabric and the breaking strength decreased. The antimicrobial property of UHMWPE dyed with N′-(2-chloro-4-methylphenyl)-2-oxo-2-(p-tolyl)acetohydrazonoyl cyanide was tested against three different microorganisms, and the results have been reported.

scholarly journals The Features of Rheological and Tribological Behavior of High-Viscosity Polyolefine Compositions Depending on Their Content

2021 ◽  
Vol 15 (4) ◽  
pp. 486-492
Author(s):  
Mykhailo Bratychak Jr ◽  
◽  
Victoria Zemke ◽  
Natalia Chopyk ◽  
◽  
...  
Keyword(s):  
Molecular Weight ◽  
Friction Coefficient ◽  
Injection Molding ◽  
Polymer Blends ◽  
High Molecular Weight ◽  
Tribological Behavior ◽  
High Viscosity ◽  
Energy Costs ◽  
Technological Properties ◽  
Ultra High Molecular Weight

The influence of additive nature as well as its ratio on the rheological, tribological and technological properties of blends based on ultra-high molecular weight polyethylene has been determined. The energy costs impact in the polymer blends processing has been studied. It is shown that the rheological and tribological properties of the samples have a complicated dependence, which is determined by inhomogeneity of the system. The paper takes into consideration the influence of the friction coefficient of material and the viscosity of its melt on energy costs during processing by injection molding or extrusion

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