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Friction behavior of high-density poly(2-methacryloyloxyethyl phosphorylcholine) brush in aqueous media
Abstract
Super-hydrophilic polymer brushes were prepared by surface-initiated atom transfer radical polymerization of 2-methacryloyloxyethyl phosphorylcholine (MPC) on initiator-immobilized silicon wafers. The graft density was estimated to be 0.22 chains nm based on the linear relationship between and the layer thickness. The contact angle against water was very low, and air bubbles in water hardly attached onto the brush surface, indicating a super-hydrophilic surface. Neutron reflectivity measurements of the poly(MPC) brush showed that the grafting polymer chains extended a fair amount in the vertical direction from the substrate in a good solvent such as water, while they shrunk in a poor solvent. Frictional properties of the poly(MPC) brushes were characterized by sliding a glass ball probe in air and various solvents under a load of 0.49 N at a sliding velocity of 90 mm min. An extremely low friction coefficient of the poly(MPC) brush was observed in humid atmosphere because water molecules adsorbed into the brush layer acted as a lubricant.
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“We note also more recent macroscopic friction studies [89, 90] on pMPC and other hydrated brushes, where higher pressures still were accessed, but where the friction coefficient was substantially higher, of order 0.01 - 0.05.”
From Hydration lubrication (2013) · cites this paper as [90]
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Metadata
- Authors
- Kobayashi, M., Terayama, Y., Hosaka, N., Kaido, M., Suzuki, A., Yamada, N., Torikai, N., Ishihara, K., & Takahara, A.
- Affiliations
- Kyushu University (JP)
- Toyota Motor Corporation (Japan) (JP)
- High Energy Accelerator Research Organization (JP)
- Corresponding author
- Takahara, Atsushi
- ORCID
- Venue
- Soft Matter
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2007
- Volume
- 3
- Issue
- 6
- Pages
- 740
- ISSN
- 1744-683X (ISSN-L)
- 1744-6848
- OpenAlex
- W2061105411
- Cited by
- 271
- References
- 47
- Citations by year
- 2026: 5 · 2025: 8 · 2024: 5 · 2023: 13 · 2022: 9 · 2021: 11 · 2020: 16 · 2019: 10 · 2018: 18 · 2017: 17 · 2016: 17 · 2015: 15 · 2014: 20 · 2013: 23 · 2012: 20
- FWCI
- 8.81
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Soft Matter (publishedVersion)
- PubMed (publishedVersion)
- Institutional Repositories DataBase (IRDB) (submittedVersion)
- Topics
- Physical Sciences › Materials Science › Surfaces, Coatings and Films › Polymer Surface Interaction Studies
- Physical Sciences › Materials Science › Surfaces, Coatings and Films › Surface Modification and Superhydrophobicity
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Force Microscopy Techniques and Applications
- Keywords
- poly(2-methacryloyloxyethyl phosphorylcholine), polymer brushes, superhydrophilic surfaces, friction coefficient, low friction, water lubrication, grafting density, neutron reflectometry, surface-initiated atom transfer radical polymerization, contact angle, air bubbles, water adsorption
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