Microstructural Interpretation of Influences of Molecular Weight on the Tensile Properties of High-Density Polyethylene Solids Using Rheo-Raman Spectroscopy

2020 ◽  
Author(s):  
Takumitsu Kida ◽  
Yusuke Hiejima ◽  
Koh-hei Nitta
Keyword(s):  
Molecular Weight ◽  
Raman Spectroscopy ◽  
Tensile Properties ◽  
High Density Polyethylene ◽  
High Density

scholarly journals Applicability of the Cox-Merz Rule to High-Density Polyethylene Materials with Various Molecular Masses

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1218
Author(s):  
Raffael Rathner ◽  
Wolfgang Roland ◽  
Hanny Albrecht ◽  
Franz Ruemer ◽  
Jürgen Miethlinger
Keyword(s):  
Molecular Weight ◽  
Pressure Drop ◽  
High Molecular Weight ◽  
High Density Polyethylene ◽  
Parallel Plate ◽  
Empirical Relationship ◽  
Polymer Processing ◽  
High Density ◽  
Viscosity Data ◽  
Molecular Masses

The Cox-Merz rule is an empirical relationship that is commonly used in science and industry to determine shear viscosity on the basis of an oscillatory rheometry test. However, it does not apply to all polymer melts. Rheological data are of major importance in the design and dimensioning of polymer-processing equipment. In this work, we investigated whether the Cox-Merz rule is suitable for determining the shear-rate-dependent viscosity of several commercially available high-density polyethylene (HDPE) pipe grades with various molecular masses. We compared the results of parallel-plate oscillatory shear rheometry using the Cox-Merz empirical relation with those of high-pressure capillary and extrusion rheometry. To assess the validity of these techniques, we used the shear viscosities obtained by these methods to numerically simulate the pressure drop of a pipe head and compared the results to experimental measurements. We found that, for the HDPE grades tested, the viscosity data based on capillary pressure flow of the high molecular weight HDPE describes the pressure drop inside the pipe head significantly better than do data based on parallel-plate rheometry applying the Cox-Merz rule. For the lower molecular weight HDPE, both measurement techniques are in good accordance. Hence, we conclude that, while the Cox-Merz relationship is applicable to lower-molecular HDPE grades, it does not apply to certain HDPE grades with high molecular weight.

Study of the Effect of a Polymeric Compatibilizing Agent on the Flame Retardancy and Tensile Properties of High Density Polyethylene/Magnesium Hydroxide Compositions

2017 ◽  
Vol 374 (1) ◽  
pp. 1600116 ◽  
Author(s):  
Edgar N. Cabrera Álvarez ◽  
Luis F. Ramos-deValle ◽  
Saul Sánchez-Valdes ◽  
Eduardo Ramírez-Vargas ◽  
Adriana B. Espinoza-Martinez ◽  
...  
Keyword(s):  
Tensile Properties ◽  
Magnesium Hydroxide ◽  
Flame Retardancy ◽  
High Density Polyethylene ◽  
High Density ◽  
Compatibilizing Agent

Effect of PEgMAH on Tensile Properties and Swelling Behaviour of Recycled High Density Polyethylene/Ethylene Vinyl Acetate/Waste Tyre Dust (r-HDPE/EVA/WTD) Composites

2014 ◽  
Vol 554 ◽  
pp. 137-140 ◽  
Author(s):  
A.R.H. Fatimah ◽  
Ikmal Hakem Abdul Aziz ◽  
A.Ghani Supri
Keyword(s):  
Maleic Anhydride ◽  
Tensile Properties ◽  
Vinyl Acetate ◽  
High Density Polyethylene ◽  
Ethylene Vinyl Acetate ◽  
High Density ◽  
Rotor Speed ◽  
Swelling Behaviour ◽  
Dust Loading ◽  
Waste Tyre

The effect of polyethylene grafted maleic anhydride as a compatibilizer on the tensile properties, and swelling behavior of recycled high density polyethylene/ethylene vinyl acetate/ waste tyre dust (r-HDPE/EVA/WTD) composites was studied. r-HDPE/EVA/WTD composites with different tyre dust loading and the addition of polyethylene grafted maleic anhydride (PEgMAH) were prepared with Brabender Plasticorder at temperature of 160°C and rotor speed of 50 rpm. The result indicated that r-HDPE/EVA/WTD/PEgMAH composites exhibit higher tensile strength, modulus of elasticity, and mass swell resistance than r-HDPE/EVA/WTD composites.

Estimating crystallinity in high density polyethylene fibers using online Raman spectroscopy

2003 ◽  
Vol 88 (2) ◽  
pp. 545-549 ◽  
Author(s):  
R. P. Paradkar ◽  
S. S. Sakhalkar ◽  
X. He ◽  
M. S. Ellison
Keyword(s):  
Raman Spectroscopy ◽  
High Density Polyethylene ◽  
High Density ◽  
Polyethylene Fibers

Influence of Processing Aids and Hydroxyapatite as Fillers on Flow Behaviour and Mechanical Properties of Ultra High Molecular Weight Polyethylene/High Density Polyethylene Composites

2011 ◽  
Vol 471-472 ◽  
pp. 827-832 ◽  
Author(s):  
Mazatusziha Ahmad ◽  
Mat Uzir Wahit ◽  
Mohammed Rafiq Abdul Kadir ◽  
Khairul Zaman Mohd Dahlan
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
High Density Polyethylene ◽  
Flexural Modulus ◽  
High Density ◽  
Compression Moulding ◽  
Biomedical Implant ◽  
Bone Properties ◽  
Ultra High Molecular Weight

In this study, blends of ultra high molecular weight polyethylene/high density polyethylene/polyethylene glycol (UHMWPE/HDPE/PEG) and the composites containing Hydroxyapatite (HA) as reinforcement filler were prepared via single screw extruder nanomixer followed by compression moulding. PEG (2phr) was used as processing aid and HA loadings were varied from 10 to 50 phr. HDPE and PEG were introduced to improve the extrudability of UHMWPE. Rheological behavior was studied via capillary rheometer while flexural and izod impact tests were conducted in order to investigate the mechanical properties of the blends and composites. Melt viscosity of the blends was found to decrease with increasing shear rate indicating a pseudoplastic behaviour. Incorporation of PEG shows a synergism effect on the reduction of blends viscosity. Blend of 40% UHMWPE/ 60% HDPE/ 2 phr PEG was chosen as the optimum blend composition with a balance properties in terms of the mechanical properties and processability. The incorporation of HA fillers from 10 to 50 phr into the blend resulted in the increase of flexural modulus and flexural strength with a slight decline of impact strength values. It can be concluded that the composites having adequate strength and modulus within the range of cancellous bone properties were succesfully developed to be used as biomedical implant devices.

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