TY - JOUR
T1 - Structure and surface properties of high-density polyelectrolyte brushes at the interface of aqueous solution
AU - Kobayashi, Motoyasu
AU - Yamaguchi, Hiroki
AU - Terayama, Yuki
AU - Wang, Zhe
AU - Ishihara, Kazuhiko
AU - Hino, Masahiro
AU - Takahara, Atsushi
PY - 2009/5
Y1 - 2009/5
N2 - Zwitterionic and cationic polyelectrolyte brushes were prepared by surface-initiated atom transfer radical polymerization of 2-methacryloyloxy- ethyl phosphorylcholine (MPC) and 2-(N, N-dimethylamino)ethyl methacrylate (DMAEMA), respectively. The poly(DMAEMA) brush was treated with methyl iodide to form poly[2-(methacryloyloxy) ethyltrimethylammonium iodide] [poly(METAI)]. The effects of ionic strength on brush structure and surface properties of densely grafted poly-electrolyte brushes were analyzed by contact angle measurements, neutron reflectivity (NR) and macroscopic friction tests. Both polyelectrolyte brushes exhibited hydrophilic properties. The contact angle of the poly(MPC) brush surface against water was ca. 08 in air and the contact angle of the air bubble in water was ca. 1708. The air bubble in water hardly attached to the poly(MPC) brush surface, indicating super hydrophilic characteristics. NR measurements of poly(MPC) and poly(METAI) brushes showed that the grafted polymer chains were extended from the substrate surface in a good solvent such as water. Interestingly, NR study did not reveal the shrinkage of the brush chain in salt solution. The polyelectrolyte brushes immersed in both water and NaCl solution at various concentrations showed a low friction coefficient and low adhesion force.
AB - Zwitterionic and cationic polyelectrolyte brushes were prepared by surface-initiated atom transfer radical polymerization of 2-methacryloyloxy- ethyl phosphorylcholine (MPC) and 2-(N, N-dimethylamino)ethyl methacrylate (DMAEMA), respectively. The poly(DMAEMA) brush was treated with methyl iodide to form poly[2-(methacryloyloxy) ethyltrimethylammonium iodide] [poly(METAI)]. The effects of ionic strength on brush structure and surface properties of densely grafted poly-electrolyte brushes were analyzed by contact angle measurements, neutron reflectivity (NR) and macroscopic friction tests. Both polyelectrolyte brushes exhibited hydrophilic properties. The contact angle of the poly(MPC) brush surface against water was ca. 08 in air and the contact angle of the air bubble in water was ca. 1708. The air bubble in water hardly attached to the poly(MPC) brush surface, indicating super hydrophilic characteristics. NR measurements of poly(MPC) and poly(METAI) brushes showed that the grafted polymer chains were extended from the substrate surface in a good solvent such as water. Interestingly, NR study did not reveal the shrinkage of the brush chain in salt solution. The polyelectrolyte brushes immersed in both water and NaCl solution at various concentrations showed a low friction coefficient and low adhesion force.
KW - 2-(N,N-dimethylamino)ethyl methacrylate
KW - 2-methacryloyloxyethyl phosphorylcholine
KW - Friction coefficient
KW - Neutron reflectivity
KW - Polyelectrolyte brush
UR - https://www.scopus.com/pages/publications/67649909156
U2 - 10.1002/masy.200950513
DO - 10.1002/masy.200950513
M3 - 文章
AN - SCOPUS:67649909156
SN - 1022-1360
VL - 279
SP - 79
EP - 87
JO - Macromolecular Symposia
JF - Macromolecular Symposia
IS - 1
ER -