Extrusion processing of ultra-high molecular weight polyethylene; a new method for the production of high performance structures

1987 ◽  
Vol 17 (2) ◽  
Author(s):  
C. Anton ◽  
M.R. Mackley ◽  
S.B. Solbai
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
High Performance ◽  
New Method ◽  
Extrusion Processing ◽  
Ultra High Molecular Weight

scholarly journals Improving Interlayer Adhesion of Poly(p-phenylene terephthalamide) (PPTA)/Ultra-high-molecular-weight Polyethylene (UHMWPE) Laminates Prepared by Plasma Treatment and Hot Pressing Technique

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2600
Author(s):  
Long Zhu ◽  
Dmitriy A. Dikin ◽  
Simona Percec ◽  
Fei Ren
Keyword(s):  
Molecular Weight ◽  
Plasma Treatment ◽  
High Molecular Weight ◽  
Hot Pressing ◽  
Composite Structures ◽  
High Performance ◽  
Surface Roughening ◽  
Moderate Increase ◽  
High Performance Polymer ◽  
Ultra High Molecular Weight

Poly(p-phenylene terephthalamide) (PPTA) is a high-performance polymer that has been utilized in a range of applications. Although PPTA fibers are widely used in various composite materials, laminar structures consisting of PPTA and ultra-high-molecular-weight polyethylene (UHMWPE), are less reported. The difficulty in making such composite structures is in part due to the weakness of the interface formed between these two polymers. In this study, a layered structure was produced from PPTA fabrics and UHMWPE films via hot pressing. To improve the interlayer adhesion, oxygen plasma was used to treat the PPTA and the UHMWPE surfaces prior to lamination. It has been found that while plasma treatment on the UHMWPE surface brought about a moderate increase in interlayer adhesion (up to 14%), significant enhancement was achieved on the samples fabricated with plasma treated PPTA (up to 91%). It has been assumed that both surface roughening and the introduction of functional groups contributed to this improvement.

Twist-film gel spinning of large-diameter high-performance ultra-high molecular weight polyethylene monofilaments

2016 ◽  
Vol 87 (19) ◽  
pp. 2323-2336 ◽  
Author(s):  
Xudong Fang ◽  
Jing Shi ◽  
Tom Wyatt ◽  
Donggang Yao
Keyword(s):  
Molecular Weight ◽  
Solvent Extraction ◽  
High Molecular Weight ◽  
High Performance ◽  
Large Diameter ◽  
High Strength ◽  
Gel Spinning ◽  
Solvent Removal ◽  
Spinning Process ◽  
Ultra High Molecular Weight

A twist-film gel spinning process was developed for large-diameter high-performance ultra-high molecular weight polyethylene (UHMWPE) monofilaments. By using polybutene as a spin-solvent, film twisting was demonstrated to be an effective method for solvent removal; approximately 70% of solvent contained in the gel film can be removed simply by film twisting. This mechanical solvent removal process also makes conventional solvent extraction proceed significantly faster. Besides improved solvent extraction efficiency, large-diameter high-strength UHMWPE monofilaments (with diameters of about 80 µm and strength exceeding 3.2 GPa) can be produced with this process, which is difficult to achieve using conventional processes. The capability of making large-diameter high-strength monofilaments may allow new products of UHMWPE to be developed in a number of high-performance applications.

High-performance materials from gel-like spherulites of ultra-high-molecular-weight polyethylene

Polymer ◽  
1989 ◽  
Vol 30 (12) ◽  
pp. 2170-2173 ◽  
Author(s):  
T. Ohta ◽  
F. Okada ◽  
M. Hayashi ◽  
M. Mihoichi
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
High Performance ◽  
Ultra High Molecular Weight

scholarly journals Multi-Scale Digital Image Correlation Analysis of In Situ Deformation of Open-Cell Porous Ultra-High Molecular Weight Polyethylene Foam

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2607
Author(s):  
Eugene S. Statnik ◽  
Codrutza Dragu ◽  
Cyril Besnard ◽  
Alexander J.G. Lunt ◽  
Alexey I. Salimon ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Digital Image Correlation ◽  
High Molecular Weight ◽  
Digital Image ◽  
High Performance ◽  
Image Correlation ◽  
Deformation Bands ◽  
Open Cell ◽  
Ultra High Molecular Weight

Porous ultra-high molecular weight polyethylene (UHMWPE) is a high-performance bioinert polymer used in cranio-facial reconstructive surgery in procedures where relatively low mechanical stresses arise. As an alternative to much stiffer and more costly polyether-ether-ketone (PEEK) polymer, UHMWPE is finding further wide applications in hierarchically structured hybrids for advanced implants mimicking cartilage, cortical and trabecular bone tissues within a single component. The mechanical behaviour of open-cell UHMWPE sponges obtained through sacrificial desalination of hot compression-moulded UHMWPE-NaCl powder mixtures shows a complex dependence on the fabrication parameters and microstructural features. In particular, similarly to other porous media, it displays significant inhomogeneity of strain that readily localises within deformation bands that govern the overall response. In this article, we report advances in the development of accurate experimental techniques for operando studies of the structure–performance relationship applied to the porous UHMWPE medium with pore sizes of about 250 µm that are most well-suited for live cell proliferation and fast vascularization of implants. Samples of UHMWPE sponges were subjected to in situ compression using a micromechanical testing device within Scanning Electron Microscope (SEM) chamber, allowing the acquisition of high-resolution image sequences for Digital Image Correlation (DIC) analysis. Special masking and image processing algorithms were developed and applied to reveal the evolution of pore size and aspect ratio. Key structural evolution and deformation localisation phenomena were identified at both macro- and micro-structural levels in the elastic and plastic regimes. The motion of pore walls was quantitatively described, and the presence and influence of strain localisation zones were revealed and analysed using DIC technique.

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