Adsorption of polyampholyte copolymers at the solid/liquid interface: the influence of pH and salt on the adsorption behaviour

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Boris Mahltig, Harald Walter, Charef Harrats, Peter Müller-Buschbaum, Robert Je′rôme and Manfred Stamm


Abstract

Polyampholytes are macromolecules that contain oppositely charged groups. We have studied the adsorption of the polyampholyte diblock copolymer poly(methacrylic acid)-block-poly((dimethylamino)ethyl methacrylate), PMAA-b-PDMAEMA, on oxidized silicon surfaces. The amount of polymer adsorbed from aqueous solution of different pH and salt concentration was measured by ellipsometry. The influence of the added salts NaCl, Na2SO4 and CaCl2 was determined. In every case adsorption took place, although the polyampholyte and the substrate exhibit the same sign of net charge. For all types of salt, the adsorbed amount shows two maxima close to the isoelectric point (IEP) of the polymer as a function of pH. Directly at the IEP of the polyampholyte, no adsorption was found. The measured dependences can be explained by the adsorption of one or the other of the two blocks depending on acidity and ionic strength. Furthermore, the lateral structure of the dried films was investigated by scanning force microscopy (SFM).


References

  1. S. Förster and M. Schmidt, Adv. Polym. Sci., 1995, 120, 51.
  2. S. E. Kudaibergenov, Adv. Polym. Sci., 1999, 144, 115 CAS.
  3. H. Dautzenberg, W. Jaeger, J. Kötz, B. Philipp, C. Seidel and D. Stscherbina, Polyelectrolytes, Hanser Publishers, Munich, 1994 Search PubMed.
  4. N. Böhm and W.-M. Kulicke, Colloid Polym. Sci., 1997, 275, 73 CrossRef CAS.
  5. G. R. Joppin, J. Phys. Chem., 1978, 82, 2210 CrossRef.
  6. Y. Kamiyama and J. Israelachvili, Macromolecules, 1992, 25, 5081 CrossRef CAS.
  7. V. Shubin and P. Linze, J. Phys. Chem., 1995, 99, 1285 CrossRef CAS.
  8. N. G. Hoogeveen, M. A. Cohen Stuart and G. J. Fleer, Faraday Discuss., 1994, 98, 161 RSC.
  9. A. V. Dobrynin, M. Rubinstein and J.-F. Joanny, Macromolecules, 1997, 30, 4332 CrossRef CAS.
  10. M. Skouri, J. P. Munch, S. J. Candau, S. Neyret and F. Candau, Macromolecules, 1994, 27, 69 CrossRef CAS.
  11. N. V. Sastry, J.-M. Séquaris and M. J. Schwuger, J. Colloid Interface Sci., 1995, 171, 224 CrossRef CAS.
  12. K. Lowack and C. A. Helm, Macromolecules, 1995, 28, 2912 CrossRef CAS.
  13. C. Amiel, M. Sikka, J. W. Schneider, Y.-H. Tsao, M. Tirrell and J. W. Mays, Macromolecules, 1995, 28, 3125 CrossRef CAS.
  14. H. Walter, C. Harrats, P. Müller-Buschbaum, R. Jérôme and M. Stamm, Langmuir, 1999, 15, 1260 CrossRef CAS.
  15. H. Walter, P. Müller-Buschbaum, J. S. Gutmann, C. Lorenz-Haas, C. Harrats, R. Jérôme and M. Stamm, Langmuir, submitted Search PubMed.
  16. Y. Zhang, M. Tirrell and J. W. Mays, Macromolecules, 1996, 29, 7299 CrossRef CAS.
  17. S. Creutz, P. Teyssié and R. Jérôme, Macromolecules, 1997, 30, 6 CrossRef CAS.
  18. S. Antoun, P. Teyssié and R. Jérôme, Macromolecules, 1997, 30, 1556 CrossRef CAS.
  19. S. Creutz, J. v. Stam, S. Antoun, F. C. De Schryver and R. Jérôme, Macromolecules, 1997, 30, 4078 CrossRef CAS.
  20. R. Pecora and B. J. Berne, Dynamic Light Scattering, John Wiley & Sons, New York, 1976 Search PubMed.
  21. H. Motschmann, M. Stamm and C. Toprakcioglu, Macromolecules, 1991, 24, 3681 CrossRef CAS.
  22. R. M. A. Azzam and N. M. Bashara, Ellipsometry and Polarized Light, North Holland, Amsterdam, 1987 Search PubMed.
  23. F. Tiberg and M. Landgren, Langmuir, 1993, 9, 927 CrossRef CAS.
  24. C. S. Patrickios, L. R. Sharma, S. P. Armes and N. C. Billingham, Langmuir, 1999, 15, 1613 CrossRef CAS.
  25. R. R. Netz and J.-F. Joanny, Macromolecules, 1998, 31, 5123 CrossRef CAS.
  26. M. A. Cohen Stuart, G. J. Fleer, J. Lyklema, W. Norde and J. M. H. M. Schcutjens, Adv. Colloid Interface Sci., 1991, 34, 477 CrossRef CAS.
  27. H. G. M. van de Steeg, M. A. Cohen Stuart, A. de Keizer and B. H. Bijsterbosch, Langmuir, 1992, 8, 2538 CrossRef CAS.
  28. S. A. Sukhishvili and S. Granick, J. Chem. Phys., 1998, 109, 6861 CrossRef CAS.
  29. C. Fenn-Barrabaß, A. Pohlmeier, W. Knoche, H. D. Narres and M. J. Schwuger, Colloid Polym. Sci., 1998, 276, 627 CrossRef.
  30. M. Olvera da la Cruz, L. Belloni, M. Delsanti, J. P. Dalbiez, O. Spalla and M. Drifford, J. Chem. Phys., 1995, 103, 5781 CrossRef.
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