Issue 6, 2007
From the journal:

Soft Matter

Friction behavior of high-density poly(2-methacryloyloxyethyl phosphorylcholine) brush in aqueous media

Motoyasu Kobayashi,a   Yuki Terayama,b   Nao Hosaka,b   Masataka Kaido,c   Atsushi Suzuki,c   Norifumi Yamada,d   Naoya Torikai,d   Kazuhiko Ishiharae  and  Atsushi Takahara*ab  

* Corresponding authors

a The Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, JAPAN
E-mail: takahara@cstf.kyushu-u.ac.jp
Fax: +81-92-802-2518
Tel: +81-92-802-2517

b Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, JAPAN

c TOYOTA Motor Co., 1 Toyota-cho, Toyota, JAPAN

d Neutron Science Laboratory, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, JAPAN

e Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyou-ku, JAPAN

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 ca. 0.22 chains nm−2 based on the linear relationship between Mn 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−1. 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.

Graphical abstract: Friction behavior of high-density poly(2-methacryloyloxyethyl phosphorylcholine) brush in aqueous media

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Article information

DOI
https://doi.org/10.1039/B615780G
Article type
Paper
Submitted
31 Oct 2006
Accepted
13 Mar 2007
First published
28 Mar 2007

Soft Matter, 2007,3, 740-746

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Friction behavior of high-density poly(2-methacryloyloxyethyl phosphorylcholine) brush in aqueous media

M. Kobayashi, Y. Terayama, N. Hosaka, M. Kaido, A. Suzuki, N. Yamada, N. Torikai, K. Ishihara and A. Takahara, Soft Matter, 2007, 3, 740 DOI: 10.1039/B615780G

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