Design of dual hydrophobic–hydrophilic polymer networks for highly lubricious polyether-urethane coatings
| Autor: | Jozua Laven, Rolf A. T. M. van Benthem, Leendert G.J. van der Ven, Peter T.M. Albers, Stefan P.W. Govers, A. Catarina C. Esteves |
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| Přispěvatelé: | Physical Chemistry, Materials and Interface Chemistry |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers and Plastics General Physics and Astronomy 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Polyvinyl alcohol chemistry.chemical_compound Coating PEG ratio Hydrophilic coating Materials Chemistry Polyurethane Aqueous solution Organic Chemistry Tribology 021001 nanoscience & nanotechnology 0104 chemical sciences Aqueous lubrication Lubricious polymer coating chemistry Chemical engineering Polymer friction engineering Dual hydrophobic/hydrophilic 0210 nano-technology Layer (electronics) Ethylene glycol |
| Zdroj: | European Polymer Journal, 111, 82-94. Elsevier |
| ISSN: | 0014-3057 |
| DOI: | 10.1016/j.eurpolymj.2018.12.004 |
| Popis: | Bio-lubricated surfaces found in nature have inspired the design of low friction polymer coatings for biomedicalapplications. This work presents a systematic study of the relation between the network structure parametersand the macroscopic friction properties of highly lubricious dual hydrophobic/hydrophilic polyurethane (PU)coatings in an aqueous environment. Chemically cross-linked PU coatings were prepared by adding poly(ethyleneglycol) mono-methyl ether (mPEG) as hydrophilic dangling chains, or poly(ethylene glycol) (PEG)-diol ashydrophilic elastically active network chains, to poly(propylene glycol) (PPG)-PU coating formulations. Thefriction behaviour of the water swollen coatings was measured using a custom-made water immersed tribologysetup. Addition of the PEG segments or mPEG dangling chains to hydrophobic PPG coatings greatly enhances thelubricious properties of the coatings. These dual hydrophobic/hydrophilic diol PU network exhibit a surface witha lower coefficient of friction compared to reference coatings from either individual precursors, demonstrating alarge synergistic effect between the hydrophobic PPG and the hydrophilic PEG in the coatings. Based on networkstructure and surface chain considerations it is hypothesized that the existence of a thin and softer hydratedsurface layer on top of a less hydrated, more rigid, coating bulk layer gives rise to the observed enhancedlubricious properties, hereby mimicking to some extent bio-lubricated systems, such as cartilage. |
| Databáze: | OpenAIRE |
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