Issue 21, 2013
From the journal:

Soft Matter

Chain dimensions and surface characterization of superhydrophilic polymer brushes with zwitterion side groups†

Motoyasu Kobayashi,a   Yuki Terayama,b   Moriya Kikuchia  and  Atsushi Takahara*abcd  

* Corresponding authors

a Japan Science and Technology Agency, ERATO Takahara Soft Interfaces Project, CE80 Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, 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, Fukuoka 819-0395, Japan

c Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

d International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Abstract

Zwitterionic polymers constitute a unique class of polyelectrolytes which have not been studied systematically because of the difficulty in their controlled synthesis and precise physicochemical characterization. The salt-concentration dependence of the chain dimensions and swollen brush structures of polyzwitterions, namely poly(2-methacryloyloxyethylphosphorylcholine) (PMPC) and poly[3-(N-2-methacryloyloxyethyl-N,N-dimethyl)ammonatopropanesulfonate] (PMAPS), in aqueous solutions of various ionic strengths was characterized by static light scattering, dynamic light scattering, atomic force microscopy (AFM), neutron reflectivity (NR), contact angle measurements, and macroscopic friction tests by sliding a glass ball under a load of 0.49 N. The hydrodynamic radius RH of PMPC was independent of NaCl concentration, whereas the RH of PMAPS markedly increased with the ionic strength. AFM and NR measurements also showed the independence of NaCl concentration of the swollen thickness of the PMPC brush in aqueous solution and significant changes in the swollen thickness of the PMAPS brush in aqueous NaCl solution. Both PMPC and PMAPS brushes showed oil detachment behavior in water and aqueous NaCl solutions. The PMPC brush had a significantly low friction coefficient (0.02–005) at a sliding velocity of 10−2 to 10−1 m s−1 in water even under a high normal pressure of 139 MPa.

Graphical abstract: Chain dimensions and surface characterization of superhydrophilic polymer brushes with zwitterion side groups

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Article information

DOI
https://doi.org/10.1039/C3SM27700C
Article type
Highlight
Submitted
22 Nov 2012
Accepted
20 Mar 2013
First published
16 Apr 2013

Soft Matter, 2013,9, 5138-5148

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Chain dimensions and surface characterization of superhydrophilic polymer brushes with zwitterion side groups

M. Kobayashi, Y. Terayama, M. Kikuchi and A. Takahara, Soft Matter, 2013, 9, 5138 DOI: 10.1039/C3SM27700C

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