Abstract
A theoretical investigation on the pH-induced switching of mixed polyelectrolyte brushes was performed by using a molecular theory. The results indicate that the switching properties of mixed polyelectrolyte brushes are dependent on the pH values. At low pH, negatively charged chains adopt a compact conformation on the bottom of the brush while positively charged chains are highly stretched away from the surface. At high pH values, the inverse transformation takes place. The role of pH determining the polymer chains conformation and charge behavior of mixed polyelectrolyte brushes was analyzed. It is found that there exists a mechanism for reducing strong electrostatic repulsions: stretching of the chains. The H+ and OH− units play a more important role as counterions of the charged polymers do. The collapse of the polyelectrolyte chains for different pH values could be attributed to the screening of the electrostatic interactions and the counterion-mediated attractive interaction along the chains.
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Houbenov, N., Minko, S. and Stamm, M., Macromolecules, 2003, 36: 5897
Mikhaylova, Y.L., Ionov, L., Rappich, J., Gensch, M., Esser, N., Minko, S., Eichhorn, K.J., Stamm, M. and Hinrichs, K., Anal. Chem., 2007, 79: 7676
Uhlmann, P., Houbenov, N., Brenner, N., Grundke, K., Burkert, S. and Stamm, M., Langmuir, 2007, 23: 57
Delcroix, M.F., Huet, G.L., Conard, T., Demoustier-Champagne, S., Du Prez, F.E., Landoulsi, J. and Dupont-Gillain, C.C., Biomacromolecules, 2013, 1: 215
Ionov, L., Houbenov, N., Sidorenko, A. and Stamm, M., Langmuir, 2004, 20: 9916
Ionov, L., Houbenov, N., Sidorenko, A., Minko, S. and Stamm, M., Polym. Mater. Sci. Eng., 2004, 90: 104
Hinrichs, K., Aulich, D., Ionov, L., Esser, N., Eichhorn, K.J., Motornov, M., Stamm, M. and Minko, S., Langmuir, 2009, 25: 10987
Bittrich, E., Kuntzsch, M., Eichhorn, K.J. and Uhlmann, P., J. Polym. Sci. Part B: Polym. Phys., 2010, 48: 1606
Vyas, M.K., Nandan, B. and Schneider, K., J. Colloid Interface Sci., 2008, 328: 58
Motornov, M., Tam, T.K., Pita, M., Tokarev, I., Katz, E. and Minko, S., Nanotechnology, 2009, 20: 434006
Hoy, O., Zdyrko, B., Lupitskyy, R., Sheparovych, R., Aulich, D., Wang, J.F., Bittrich, E., Eichhorn, K.J., Uhlmann, P., Hinrichs, K., Muller, M., Stamm, M., Minko, S. and Luzinov, I., Adv. Funct. Mater., 2010, 20: 2240
Ochsmann, J.W., Lenz, S., Lellig, P., Emmerling, S.G.J., Golriz, A.A., Reichert, P., You, J.C., Perlich, J., Roth, S.V., Berger, R. and Gutmann, J.S., Macromolecules, 2012, 45: 3129
Shusharinaa, N.P. and Linse, P., Eur. Phys. J.E, 2001, 6: 147
Biesheuvel, P.M. and Cohen-Stuart, M.A., Langmuir, 2004, 20: 2785
Witte, K.N. and Won, Y.Y., Macromolecules, 2006, 39: 7757
Szleifer, I. and Carignano, M.A., Macromol. Rapid Commun., 2000, 21: 423
Ren, C.L., Nap, R.J. and Szleifer, I., J. Phys. Chem. B., 2008, 112: 16238
Ren, C.L., Carvajal, D., Shull, K.R., and Szleifer, I., Langmuir, 2009, 25: 12283
Brilliantov, N.V., Kuznetsov, D.V. and Klein, R., Phys. Rev. Lett., 1998, 81: 1433
Nap, R., Gong, P. and Szleifer, I., J. Polym. Sci. Part B: Polym. Phys., 2006, 44: 2638
Longo, G.S., De La Cruzab, M.O. and Szleifer, I., Soft Matter, 2012, 8: 1344
Dong, R., Lindau, M. and Ober, C.K., Langmuir, 2009, 25: 4774
Hehmeyer, O.J., Arya, G., Panagiotopoulos, A.Z. and Szleifer, I., J. Chem. Phys., 2007, 126: 244902
Seki, H., Suzuki, Y.Y. and Orland, H., J. Phys. Soc. Jap., 2007, 76: 104601
Winkler, R.G., Gold, M. and Reineker, P., Phys. Rev. Lett., 1998, 80: 3731
Kumar, R., Sumpter, B.G. and Kilbey, S.M., J. Chem. Phys., 2012, 136: 234901
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This work was financially supported by the National Natural Science Foundation of China (Nos. 21264016 and 11265015) and the General Foundation of Yi Li Normal University (No. 2013YSYB17). Accepted November 19, 2013
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Zhao, Xj., Zhang, Gl. A theoretical investigation on the pH-induced switching of mixed polyelectrolyte brushes. Chin J Polym Sci 32, 568–576 (2014). https://doi.org/10.1007/s10118-014-1429-6
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DOI: https://doi.org/10.1007/s10118-014-1429-6