Concentrated Polymer Brush as Reciprocating Seal Material for Low Leakage and Low Friction

Tadokoro, Chiharu; Sato, Kimitoshi; Nagamine, Takuo; Nakano, Ken; Sasaki, Shinya; Sato, Takaya; Sakakibara, Keita; Tsujii, Yoshinobu

doi:10.1080/10402004.2019.1650213

Cited by 13 publications

(9 citation statements)

References 24 publications

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“…In particular, polymer brushes with a normalised graft density higher than 10% is known as a 'concentrated polymer brush (CPB)' [9]. CPBs in good solvents have been reported to exhibit ultralow friction in both micro [10] and macro [11][12][13][14] scale sliding; therefore, their application to mechanical components such as bearings and oil seals is expected. The challenge of applying CPBs for actual industrial applications is their durability against friction.…”

Section: Introductionmentioning

confidence: 99%

Durability Improvement of Concentrated Polymer Brushes by Multiscale Texturing

et al. 2021

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Concentrated polymer brushes (CPBs) are promising soft-material coatings for improving tribological properties under severe sliding conditions, even in the macroscopic scale. Therefore, they are expected to be applied to mechanical sliding components. However, the durability of CPBs has remained challenging for industrial applications. Previous studies revealed that applying a groove texture to the CPB substrate is effective in improving the durability of CPBs. In order to achieve further improvement of durability of CPBs, we attempted to apply the periodical structure, which is a microfabricated structure corresponding to a surface roughness 0.02 μm, whereas the groove texture applied in previous studies has widths and depths in micrometres. In this study, the effect of the nano-periodic structure in addition to the groove texture applied to the CPB substrate on the durability of CPB is investigated. The results demonstrate a signi cant improvement in the durability of CPBs by up to 90% compared with non-textured CPB when an appropriate nano-periodic structure is applied (i.e. a nano-periodic structure oriented parallel to the groove texture).

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Section: Introductionmentioning

confidence: 99%

Durability Improvement of Concentrated Polymer Brushes by Multiscale Texturing

et al. 2021

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“…Ionic liquids have attracted considerable interest because of the nonvolatility, high viscosity, wide miscibility, , and electrochemical and thermal stabilities . The wettability of the ionic liquid to the material surface is also fundamentally important for the development of functional applications, including separators in lithium-ion batteries, − channels of microfluidics, − ionic liquid membranes, − and conducting materials consisting of polyelectrolytes. − Polymer brush combined with ionic liquids also shows unique properties, such as extremely low friction, − smart liquid separation, and thermo-responsible wettability control . Ionic liquid induces swelling of polymer brushes.…”

Section: Introductionmentioning

confidence: 99%

Spreading Dynamics of a Precursor Film of Ionic Liquid or Water on a Micropatterned Polyelectrolyte Brush Surface

et al. 2021

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Time evolution of the microscopic wetting velocity of 1-ethyl-3methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TFSI) or water on a micrometer-scale line-patterned surface with a poly(3-sulfopropyl methacrylate) brush and a hydrophobic perfluoroalkyl monolayer was precisely measured by direct observation using optical microscopy and a selective dyeing method over a long period (178 days). When a liquid droplet was placed on the dyed linepatterned brush surface, the liquid penetrated and spread into the polymer brush layer, forming a precursor thin film that extended beyond the macroscopic contact line. The elongation proceeded in two stages by an adiabatic process followed by a diffusive process. The elongation distance X increased with time in proportion to t 2.6 for water and t 0.81 for EMI-TFSI during the adiabatic process. In a diffusive process, the advancing velocity of the precursor film was markedly reduced to be expressed as X ∝ t 0.66 for water and X ∝ t 0.21 for EMI-TFSI, indicating that the diffusive process was affected by the energy dissipation of the wetting system. The high viscosity and the strong molecular interaction of EMI-TFSI with the polymer brush gave a large entropy change during the wetting process to result in a slower spreading velocity.

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“…Since the study done by Grosch (1963) showing the master curve of friction coefficient according to Williams-Landel-Ferry (WLF) theory (Williams et al, 1955), the importance of viscoelasticity has been recognized, and the dependence of the friction coefficient on temperature and velocity has been investigated [e.g., ]. More recently, several swollen polymers showing high elasticity and ultra-low friction (e.g., hydrogels and polymer brushes) have been found (Gong et al, 2001;Nomura et al, 2011), some of which are being developed toward practical applications (Belin et al, 2018;Tadokoro et al, 2020), and their tribological properties have also been discussed in relation to their viscoelastic properties (Mizukami et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Contact Mechanics Perspective of Tribology

2021

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Concentrated Polymer Brush as Reciprocating Seal Material for Low Leakage and Low Friction

Cited by 13 publications

References 24 publications

Durability Improvement of Concentrated Polymer Brushes by Multiscale Texturing

Durability Improvement of Concentrated Polymer Brushes by Multiscale Texturing

Spreading Dynamics of a Precursor Film of Ionic Liquid or Water on a Micropatterned Polyelectrolyte Brush Surface

Contact Mechanics Perspective of Tribology

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