scholarly journals High pressure deep-release impact experiments on high density and ultra-high molecular weight polyethylene

2018 ◽  
Author(s):  
D. E. Hooks ◽  
J. M. Lang ◽  
J. D. Coe ◽  
D. M. Dattelbaum
Keyword(s):  
Molecular Weight ◽  
High Pressure ◽  
High Molecular Weight ◽  
High Density ◽  
Impact Experiments ◽  
Ultra High Molecular Weight

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.

scholarly journals High-density polyethylene crystals with double melting peaks induced by ultra-high-molecular-weight polyethylene fibre

2018 ◽  
Vol 5 (7) ◽  
pp. 180394 ◽  
Author(s):  
Weijun Miao ◽  
Hao Zhu ◽  
Tianchen Duan ◽  
Hongbing Chen ◽  
Feng Wu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
High Density Polyethylene ◽  
Fibre Composite ◽  
Crystal Form ◽  
High Density ◽  
Scanning Calorimetry ◽  
Orthorhombic Crystal ◽  
Fibre Composites ◽  
Ultra High Molecular Weight

High-density polyethylene (HDPE)/ultra-high-molecular-weight polyethylene (UHMWPE) fibre composites were prepared via solution crystallization to investigate the components of epitaxial crystal growth on a highly oriented substrate. Scanning electron microscopy morphologies of HDPE crystals on UHMWPE fibres revealed that the edge-on ribbon pattern crystals that were formed initially on UHMWPE fibres converted afterwards to a sheet shape as crystallization progressed. Wide-angle X-ray diffraction confirmed that the polymer chain oriented along the fibre axis and the orthorhombic crystal form of HDPE remained unchanged in HDPE/UHMWPE fibre composite systems. The thermal behaviour of the fibre composites measured by differential scanning calorimetry showed double melting peaks, the nature of which, as disclosed by partial melting experiments, is ascribed to bilayer components existing in the induced crystals: the inner layer is composed of more regularly folded chain crystals induced by UHMWPE fibres, and the outer layer formed on the inner one with a thinner and lower ordered crystal structure.

High-pressure Raman studies of ultra-high-molecular-weight polyethylene

Polymer ◽  
1990 ◽  
Vol 31 (8) ◽  
pp. 1425-1428 ◽  
Author(s):  
Yongnian Zhao ◽  
Jin Wang ◽  
Qiliang Cui ◽  
Zhenxian Liu ◽  
Meilin Yang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Pressure ◽  
High Molecular Weight ◽  
Ultra High Molecular Weight
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