Tribological Properties of Double-Network Gels Substituted by Ionic Liquids
| Autor: | Toshio Kamijo, Takashi Morinaga, Saika Honma, Fumiya Muto, Hiroyuki Arafune, Takaya Sato |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Thermogravimetric analysis
Materials science 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound lcsh:Science ionic liquid chemistry.chemical_classification Mechanical Engineering double-network gel Adhesion Polymer Tribology 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Solvent chemistry Chemical engineering electrostatic interaction Self-healing hydrogels Ionic liquid lcsh:Q 0210 nano-technology low friction Tribometer |
| Zdroj: | Lubricants, Vol 6, Iss 4, p 89 (2018) |
| ISSN: | 2075-4442 |
| Popis: | Since human body joints have a gel-like structure with low friction that persists for several decades, hydrogels have attracted much interest for developing low-friction materials. However, such advantages can hardly be realized in industrial usage because water in the gel evaporates easily and the gel deswells. The substitution of water with an ionic liquid (IL) is one of the effective ways to overcome this problem. In this study, we substituted water in a double network (DN) hydrogel with 3-ethyl-1-methyl-imidazolium ethylsulfate (EMI-EtSulf), a hydrophilic IL, via a simple solvent exchange method to obtain a DN ion gel. A compressive test and thermogravimetric analysis showed that the DN ion gel has a high compression fracture stress and improved thermal properties, with the difference in 10% loss of temperature being ΔT10 = 234 °C. A friction test conducted using a reciprocating tribometer showed that the friction of a glass ball/DN ion gel was relatively higher than that of a glass ball/DN hydrogel. Because the minimum coefficient of friction (COF) value increased after substitution, the increase in polymer adhesion caused by the electrostatic shielding of the surface moieties of glass and poly 2-acrylamidomethylpropanesulfonic acid (PAMPS) was considered the main contributor to the high friction. As the COF value decreased with increasing temperature, the DN ion gel can achieve low friction via the restriction of polymer adhesion at high temperatures, which is difficult in the DN hydrogel owing to drying. |
| Databáze: | OpenAIRE |
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