Preparation, tribological properties and biocompatibility of fluorinated graphene/ultrahigh molecular weight polyethylene composite materials

2016 ◽  
Vol 370 ◽  
pp. 201-208 ◽  
Author(s):  
L. Xu ◽  
Y. Zheng ◽  
Z. Yan ◽  
W. Zhang ◽  
J. Shi ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Composite Materials ◽  
Tribological Properties ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Polyethylene Composite ◽  
Ultrahigh Molecular Weight ◽  
Fluorinated Graphene

Biomimetic surface design for ultrahigh molecular weight polyethylene to improve the tribological properties

2012 ◽  
Vol 226 (8) ◽  
pp. 705-713 ◽  
Author(s):  
Bo Zhang ◽  
Wei Huang ◽  
Xiaolei Wang
Keyword(s):  
Molecular Weight ◽  
Tribological Properties ◽  
Articular Surface ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Industrial Applications ◽  
Wear Depth ◽  
Surface Design ◽  
Area Density ◽  
Ultrahigh Molecular Weight ◽  
Average Wear

Tribological problem is a major obstacle that limits the using of ultrahigh molecular weight polyethylene (UHMWPE) in industrial applications and orthopedic surgeries. Many efforts have been made to improve the tribological properties of UHMWPE, such as promoting the structure, morphology, and mechanical properties of the polymer. Inspired by the features of articular surface, micro-scaled texture is introduced to improve the tribological properties of UHMWPE using micro-imprint lithography. Friction and wear experiments are conducted on textured and untextured specimens using ring-on-disc test apparatus under water lubrication. The experimental results demonstrate that the micro-scaled surface texture can remarkably improve the tribological properties of UHMWPE. Friction force can be effectively reduced by selecting suitable dimple parameters. Compared with an untextured UHMWPE, the textured one with optimum parameters shows a reduction in the friction coefficient as much as 66.7–85.7% on different load–speed conditions. The optimized area density of surface textured UHMWPE ranges from 22.9% to 29.9%, which is obviously higher than that of stiff materials such as metals and ceramics. The textured UHMWPE with area density 29.9%, diameter 50 µm, and depth 15 µm presents a significant effect of wear resistance. The average wear depth of textured UHMWPE is 35.5% of that of untextured one.

Preparation and Characterization of MWCNT/Ultrahigh-Molecular-Weight Polyethylene Composite Fiber

2012 ◽  
Vol 627 ◽  
pp. 761-764
Author(s):  
Tao Zhang ◽  
Tian Ma ◽  
Jian Chun Zhang ◽  
Peng Gang Gao ◽  
Hua Zhang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Precursor Solution ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Composite Fiber ◽  
Gel Spinning ◽  
Polyethylene Composite ◽  
Ultrahigh Molecular Weight ◽  
Aggregation Structure ◽  
Uhmwpe Fibers

MWCNT/Ultrahigh-molecular-weight polyethylene (MWCNT/UHMWPE) composite was prepared by adding purified MWCNTs into the precursor solution of UHMWPE. Based on that, MWCNT/UHMWPE fibers were obtained using a gel spinning-molding technique. The thermal, mechanical and aggregation structure of MWCNT/UHMWPE fibers were characterized by TGA, mechanical property measurement and XRD, respectively. The results indicated the incorporation of MWCNTs into UHMWPE macromolecular chains have not change the aggregation structure of UHMWPE significantly, and the as-prepared MWCNT/UHMWPE fibers have evidently improved thermal stability and mechanical strength compared with the pristine UHMWPE fibers.

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