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Carbon Nanotube Reinforced Polyimide Thin-film for High Wear Durability

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Abstract

In this paper, the influence of single walled carbon nano tubes (SWCNTs) addition on the tribological properties of the polyimide (PI) films on silicon substrate was studied. PI films, with and without SWCNTs, were spin coated onto the Si surface. Coefficient of friction and wear durability were characterized using a ball-on-disk tribometer by employing a 4 mm diameter Si3N4 ball sliding against the film, at a contact pressure of ∼370 MPa, and a sliding velocity of 0.042 ms−1. Water contact angle, AFM topography, and nano-indentation tests were conducted to study the physical and mechanical properties of the films. SWCNTs marginally increased the water contact angle of PI film. The addition of SWCNTs to PI has increased the hardness and elastic modulus of pristine PI films by 60–70%. The coefficient of friction of PI films increased slightly (∼20%) after the addition of SWCNTs, whereas, there was at least two-fold increase in the wear life of the film based on the film failure condition of coefficient of friction higher than 0.3. However, the film did not show any sign of wear even after 100,000 cycles of rotation indicating its robustness. This increase in the wear durability due to the addition of the SWCNTs is believed to be because of the improvement in the load-bearing capacity of the composite film and sliding induced microstructural changes of the composite film.

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Acknowledgments

This work was supported by the NUS Nanoscience and Nanotechnology Initiative (NUSNNI) research grant #R-265-000-132-112. One of the authors (NS) wishes to acknowledge the help with research scholarship provided by the Graduate School of Engineering, NUS. Authors wish to thank Mr. Murali and Dr. Shaofeng Wang for their help in some of the experiments mentioned in this paper.

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Correspondence to Sujeet K. Sinha.

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Satyanarayana, N., Rajan, K.S.S., Sinha, S.K. et al. Carbon Nanotube Reinforced Polyimide Thin-film for High Wear Durability. Tribol Lett 27, 181–188 (2007). https://doi.org/10.1007/s11249-007-9219-8

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