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Bulk Oriented UHMWPE/FMWCNT Films for Tribological Applications
Aleksey V Maksimkin1,2, Saidkhuja G Nematulloev3, Dilyus I Chukov4,5
1National University of Science and Technology "MISIS", Moscow 119049, Russia. aleksey_maksimkin@mail.ru.
Polymers
|April 11, 2019
Summary
Adding fluorinated multi-walled carbon nanotubes (FMWCNTs) to bulk oriented ultrahigh molecular weight polyethylene (UHMWPE) films significantly enhances tensile strength and tribological properties. These advanced UHMWPE films show potential for use in demanding applications like prosthetics and bearings.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Ultrahigh molecular weight polyethylene (UHMWPE) is a crucial polymer for biomedical implants and industrial components.
- Enhancing the mechanical and tribological properties of UHMWPE is essential for improving device longevity and performance.
- Carbon nanotubes offer unique properties that can be leveraged to reinforce polymer matrices.
Purpose of the Study:
- To investigate the effect of incorporating fluorinated multi-walled carbon nanotubes (FMWCNTs) into bulk oriented UHMWPE films.
- To evaluate the structural, mechanical, and tribological enhancements resulting from FMWCNT addition.
- To determine the optimal concentration of FMWCNTs for improved film properties.
Main Methods:
- Bulk oriented UHMWPE films were prepared using low solvent concentration and a drawing ratio of 35.
- Films were filled with varying concentrations of FMWCNTs.
- Structural analysis was performed using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC).
- Mechanical properties (tensile strength, hardness) and tribological properties (contact pressure, wear rate, coefficient of friction) were evaluated.
Main Results:
- A 10% increase in tensile strength (up to 1020 ± 23 MPa) was observed with 0.05 wt% FMWCNT addition.
- Higher FMWCNT concentrations (>0.5 wt%) led to decreased tensile strength due to aggregation.
- UHMWPE/1% FMWCNT films exhibited an 18-fold increase in maximum operating contact pressure and a significantly reduced specific wear rate.
- A low dry coefficient of friction (COF) of 0.075 was achieved at 31 MPa contact pressure.
Conclusions:
- FMWCNT incorporation significantly improves the mechanical strength and tribological performance of bulk oriented UHMWPE films.
- Optimized FMWCNT content enhances UHMWPE's suitability for high-stress applications.
- The developed films are promising for manufacturing frictional surfaces in sliding bearings and acetabular cups for joint endoprostheses.
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