Tribological properties of hydrophilic polymer brushes under wet conditions

Motoyasu Kobayashi, Atsushi Takahara

研究成果: Contribution to journalArticle査読

114 被引用数 (Scopus)

抄録

This article demonstrates a water-lubrication system using high-density hydrophilic polymer brushes consisting of 2,3-dehydroxypropyl methacrylate (DHMA), vinyl alcohol, oligo(ethylene glycol)methyl ether methacrylate, 2-(methacryloyloxy)ethyltrimethylammonium chloride (MTAC), 3-sulfopropyl methacrylate potassium salt (SPMK), and 2-methacryloyloxyethyl phosphorylcholine (MPC) prepared by surface-initiated controlled radical polymerization. Macroscopic frictional properties of brush surfaces were characterized by sliding a glass ball probe in water using a ball-on-plate type tribotester under the load of 0.1-0.49 N at the sliding velocity of 10-5-10-1 m s-1 at 298 K. A poly(DHMA) brush showed a relatively larger friction coefcient in water, whereas the polyelectrolyte brushes, such as poly(SPMK) and poly(MPC), revealed significantly low friction coefficients below 0.02 in water and in humid air conditions. A drastic reduction in the friction coefficient of polyelectrolyte brushes in aqueous solution was observed at around 10-3-10-2 m s-1 owing to the hydrodynamic lubrication effect, however, an increase in salt concentration in the aqueous solution led to the increase in the friction coefficients of poly(MTAC) and poly(SPMK) brushes. The poly(SPMK) brush showed a stable and low friction coefficient in water even after sliding over 450 friction cycles, indicating a good wear resistance of the brush film.

本文言語英語
ページ(範囲)208-216
ページ数9
ジャーナルChemical Record
10
4
DOI
出版ステータス出版済み - 8 2010

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 生化学
  • 化学工学(全般)
  • 材料化学

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