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Polymers 2017, 9(11), 629; https://doi.org/10.3390/polym9110629

Bulk Oriented UHMWPE/FMWCNT Films for Tribological Applications

1
National University of Science and Technology “MISIS”, Moscow 119049, Russia
2
Tambov State Technical University, Tambov 392000, Russia
3
Mechanical Engineering Research Institute of the Russian Academy of Sciences, Moscow 101990, Russia
*
Author to whom correspondence should be addressed.
Received: 16 October 2017 / Revised: 14 November 2017 / Accepted: 17 November 2017 / Published: 19 November 2017
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Abstract

Bulk oriented films based on ultrahigh molecular weight polyethylene (UHMWPE) with a drawing ratio of 35 were prepared by using a low solvent concentration. Bulk oriented films were filled with fluorinated multi-walled carbon nanotubes (FMWCNTs). The structure of bulk oriented films on UHMWPE, which were manufactured at different stages of orientation, was investigated by scanning electron microscope (SEM) and differential scanning calorimetry (DSC). The addition of FMWCNTs at a concentration of 0.05 wt % in bulk oriented UHMWPE films led to an increase in the tensile strength by 10% (up to 1020 ± 23 MPa) compared to unfilled oriented films. However, the addition of FMWCNTs at a concentration of more than 0.5 wt % led to a decrease in tensile strength due to excessive accumulation of nanotubes and hindering of self-diffusion of UHMWPE macromolecules. The multiple increase in tensile strength, doubling the hardness, the formation of fibrillar structure, and the presence of carbon nanotubes led to a significant increase in tribological properties in bulk oriented films. Bulk oriented UHMWPE/1% FMWCNT films can be operated at a maximum contact pressure that is 18 times higher and exhibit a specific wear rate more than an order of magnitude and less than the traditional UHMWPE of isotropic structure. Bulk oriented UHMWPE/1% FMWCNT films have an extremely low dry coefficient of friction (COF) of 0.075 at a contact pressure of 31 MPa. The developed bulk oriented films can be used for manufacturing frictional surfaces for sliding bearings, or for acetabular cups for knee and hip endoprostheses. View Full-Text
Keywords: UHMWPE; films; supramolecular structure; strength; coefficient of friction; wear rate UHMWPE; films; supramolecular structure; strength; coefficient of friction; wear rate
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Maksimkin, A.V.; Nematulloev, S.G.; Chukov, D.I.; Danilov, V.D.; Senatov, F.S. Bulk Oriented UHMWPE/FMWCNT Films for Tribological Applications. Polymers 2017, 9, 629.

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