Effect of Electron Beam Treatment in Air on Surface Properties of Ultra-High-Molecular-Weight Polyethylene
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In this study, ultra-high-molecular-weight polyethylene (UHMWPE) was treated by an electron beam (EB) in air to obtain polar hydroxyl and carbonyl functional groups, which originated from oxidizing agents, to improve hydrophobicity and cell adhesion (NCTC clone L929). Sample characterization using Fourier transform-infrared spectroscopy revealed the presence of carbonyl oxidation products, whose intensity and surface roughness increased with increasing irradiation dose. The substitution of polar groups into the surface layers of the polymers resulted in a decreased water contact angle. The observed differences in the water contact angle of untreated polymers relative to that of the treated samples can be attributed not only to the differences in their respective molecular composition but also to their distinct roughness values. The treatment conditions affected the adhesion characteristics of fibroblasts. The untreated polymer and the surfaces treated at 10.7 kGy maintained the adhesion, spreading, and proliferation of fibroblasts. The hydrophilic polymer treated at 46.5 and 106.5 kGy maintained only the initial adhesion of fibroblasts. Thus, this study shows that EB treatment is a useful tool for modifying the surface properties of UHMWPE for particular biomedical applications. For example, the initially hydrophobic surface of UHMWPE can be made either hydrophilic or moderately hydrophobic by varying the surface treatment procedure using EB.
KeywordsSurface treatment Polymer Wettability Topography Electron beam Ultra-high-molecular-weight polyethylene Cells
This research was supported by the Russian President grant (MK-6459.2016.8), the state-order NAUKA (#1359). The authors would like to express their gratitude to M.S. Vorobyov from the Institute of High Current Electronics, Tomsk, Russia for the EB processing of polymers.
- 10.Atta, A., Fawzy, Y. H. A., Bek, A., Abdel-Hamid, H. M., & El-Oker, M. M. (2013). Modulation of structure, morphology and wettability of polytetrafluoroethylene surface by low energy ion beam irradiation. Nuclear Instruments and Methods in Physics Research Section B, 300, 46–53.CrossRefGoogle Scholar
- 11.Bykova, I., Weinhardt, V., Kashkarova, A., Lebedev, S., Baumbach, T., Pichugin, V., et al. (2014). Physical properties and biocompatibility of UHMWPE-derived materials modified by synchrotron radiation. Journal of Materials Science: Materials in Medicine, 25, 1843–1852.Google Scholar
- 15.Clark, D. T., & Dilks, A. (1978). ESCA applied to polymers. XVIII. RF glow discharge modification of polymers in helium, neon, argon, and krypton. Journal of Polymer Science: Polymer Chemistry Edition, 16, 911–936.Google Scholar
- 20.Murray, K. A., Kennedy, J. E., McEvoy, B., Vrain, O., Ryan, D., Cowman, R., & Higginbotham, C. L. (2013). Effects of gamma ray and electron beam irradiation on the mechanical, thermal, structural and physicochemical properties of poly (ether-block-amide) thermoplastic elastomers. Journal of the Mechanical Behavior of Biomedical Materials, 17, 252–268.CrossRefGoogle Scholar
- 21.Murray, K. A., Kennedy, J. E., McEvoy, B., Vrain, O., Ryan, D., Cowman, R., & Higginbotham, C. L. (2013). The influence of electron beam irradiation conducted in air on the thermal, chemical, structural and surface properties of medical grade polyurethane. European Polymer Journal, 49, 1782–1795.CrossRefGoogle Scholar
- 38.Junkar, I., Cvelbar, U., & Lehocky, M. (2011). Plasma treatment of biomedical materials. Materiali in Tehnologije, 45, 221–226.Google Scholar