Polyelectrolyte brushes

A novel stable lubrication system in aqueous conditions

Motoyasu Kobayashi, Masami Terada, Atsushi Takahara

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Surface-initiated controlled radical copolymerizations of 2-dimethylaminoethyl methacrylate (DMAEMA), 2-(methacryloyloxy)ethyl phosphorylcholine (MPC), 2-(methacryloyloxy)ethyltrimethylammonium chloride) (MTAC), and 3-sulfopropyl methacrylate potassium salt (SPMK) were carried out on a silicon wafer and glass ball to prepare polyelectrolyte brushes with excellent water wettability. The frictional coefficient of the polymer brushes was recorded on a ball-on-plate type tribometer by linear reciprocating motion of the brush specimen at a selected velocity of 1.5 × 10-3 m s-1 under a normal load of 0.49 N applied to the stationary glass ball (d = 10 mm) at 298 K. The poly(DMAEMA-co-MPC) brush partially cross-linked by bis(2-iodoethoxy)ethane maintained a relatively low friction coefficient around 0.13 under humid air (RH > 75%) even after 200 friction cycles. The poly(SPMK) brush revealed an extremely low friction coefficient around 0.01 even after 450 friction cycles. We supposed that the abrasion of the brush was prevented owing to the good affinity of the poly(SPMK) brush for water forming a water lubrication layer, and electrostatic repulsive interactions among the brushes bearing sulfonic acid groups. Furthermore, the poly(SPMK-co-MTAC) brush with a chemically cross-linked structure showed a stable low friction coefficient in water even after 1400 friction cycles under a normal load of 139 MPa, indicating that the cross-linking structure improved the wear resistance of the brush layer.

Original languageEnglish
Pages (from-to)403-412
Number of pages10
JournalFaraday Discussions
Volume156
DOIs
Publication statusPublished - 2012

Fingerprint

lubrication systems
brushes
Brushes
Polyelectrolytes
Lubrication
Friction
coefficient of friction
balls
friction
Phosphorylcholine
Water
water
cycles
Chlorides
Bearings (structural)
chlorides
Glass
tribometers
Ethane
Sulfonic Acids

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Cite this

Polyelectrolyte brushes : A novel stable lubrication system in aqueous conditions. / Kobayashi, Motoyasu; Terada, Masami; Takahara, Atsushi.

In: Faraday Discussions, Vol. 156, 2012, p. 403-412.

Research output: Contribution to journalArticle

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