Analogy in adsorption behavior of homopolyelectrolyte mixtures as compared to analogous diblock polyampholytes

The adsorption behavior of aqueous mixtures of the homopolyelectrolytes poly(methacrylic acid) (PMAA) and poly[(dimethylamino)ethyl methacrylate] (PDMAEMA) was investigated in comparison with the adsorption of the ampholytic diblock copolymer PMAA-b-PDMAEMA on silicon substrates. Ellipsometry was used to determine the amount of adsorbed homopolyelectrolyte and diblock polyampholyte. Furthermore, the topography of the adsorbed polymers was investigated with atomic force microscopy (AFM) and compared with the structures observed in aqueous solutions by dynamic light scattering (DLS). For all types of investigated polyelectrolytic mixtures or the single polyampholyte, the adsorption was strongly influenced by the pH of the polymer solution. Although single homopolyelectrolytes showed only one maximum in adsorption according to their charge, the mixtures made from these homopolyelectrolytes showed two or three maxima. The third maximum near the isoelectric point of the mixture was assigned to a new species formed by aggregation of the two homopolyelectrolytes. Altogether, the adsorption behavior of the polyelectrolytic mixtures was in between the behavior of the pure homopolyelectrolytes and the analogous polyampholytes and therefore understandable from both of these polymer species.

[1]  M. Stamm,et al.  Highly Regular Polyampholytic Structures Adsorbed Directly from Solution , 2001 .

[2]  M. Stamm,et al.  Diblock polyampholytes at the silicon–water interface: Adsorption as a function of block ratio and molecular weight , 2001 .

[3]  M. Stamm,et al.  Aggregates Formed by Amphoteric Diblock Copolymers in Water , 2000 .

[4]  J. Lu,et al.  pH-Controlled Adsorption of Polyelectrolyte Diblock Copolymers at the Solid/Liquid Interface , 2000 .

[5]  M. Stamm,et al.  Adsorption of block polyampholyte micelles in monolayers at the silicon water interface , 2000 .

[6]  F. Schmitt,et al.  Changes in the interaction characteristics of polyelectrolyte complex covered silica surfaces , 2000 .

[7]  M. C. Stuart,et al.  Association Behavior of Ampholytic Diblock Copolymers , 1999 .

[8]  M. Stamm,et al.  Lateral structures of thin films of ampholytic diblock copolymers adsorbed from dilute aqueous solution at the solid/liquid interface , 1999 .

[9]  A. Dobrynin,et al.  Long-Range Multichain Adsorption of Polyampholytes on a Charged Surface , 1999 .

[10]  K. Lunkwitz,et al.  Salt effect on formation and properties of interpolyelectrolyte complexes and their interactions with silica particles , 1999 .

[11]  R. Tijssen,et al.  Comparison of methods for the determination of diffusion coefficients of polymers in dilute solutions: The influence of polydispersity , 1999 .

[12]  M. Stamm,et al.  Adsorption of ampholytic diblock copolymers from dilute aqueous solution at the solid/liquid interface , 1999 .

[13]  S. Kudaibergenov.  Recent Advances in the Study of Synthetic Polyampholytes in Solutions , 1999 .

[14]  M. Stamm,et al.  Adsorption of polyampholyte copolymers at the solid/liquid interface: the influence of pH and salt on the adsorption behaviour , 1999 .

[15]  S. Sukhishvili,et al.  Polyelectrolyte adsorption onto an initially-bare solid surface of opposite electrical charge , 1998 .

[16]  Werner,et al.  Extended Electrokinetic Characterization of Flat Solid Surfaces. , 1998, Journal of colloid and interface science.

[17]  W. Knoche,et al.  Kinetics and equilibrium of the complexation of Al3+ with poly(maleic, acrylic) acid , 1998 .

[18]  Netz,et al.  Complexation Behavior of Polyampholytes and Charged Objects. , 1998, Macromolecules.

[19]  H. Dautzenberg.  Polyelectrolyte Complex Formation in Highly Aggregating Systems. 1. Effect of Salt: Polyelectrolyte Complex Formation in the Presence of NaCl , 1997 .

[20]  H. Motschmann,et al.  Description of a single modular optical setup for ellipsometry, surface plasmons, waveguide modes, and their corresponding imaging techniques including Brewster angle microscopy , 1997 .

[21]  R. Jerome,et al.  Exchange of Polymer Molecules between Block Copolymer Micelles Studied by Emission Spectroscopy. A Method for the Quantification of Unimer Exchange Rates , 1997 .

[22]  R. Jerome,et al.  Lithium diisopropylamide as initiator for the anionic polymerization of methacrylates , 1997 .

[23]  R. Jerome,et al.  Living Anionic Homopolymerization and Block Copolymerization of (Dimethylamino)ethyl Methacrylate , 1997 .

[24]  M. Tirrell,et al.  Effects of Ionic Strength and Counterion Valency on Adsorption of Hydrophobically Modified Polyelectrolytes , 1996 .

[25]  G. J. Fleer,et al.  Polyelectrolyte adsorption on oxides. 2. Reversibility and exchange. , 1996 .

[26]  G. J. Fleer,et al.  Polyelectrolyte adsorption on oxides. I. Kinetics and adsorbed amounts , 1996 .

[27]  M. O. D. L. Cruz,et al.  Precipitation of highly charged polyelectrolyte solutions in the presence of multivalent salts , 1995 .

[28]  M. Schwuger,et al.  Adsorption of Polyacrylic Acid and Sodium Dodecylbenzenesulfonate on Kaolinite , 1995 .

[29]  P. Linse,et al.  Effect of Electrolytes on Adsorption of Cationic Polyacrylamide on Silica: Ellipsometric Study and Theoretical Modeling , 1995 .

[30]  T. A. Hatton,et al.  Diblock, ABC triblock, and random methacrylic polyampholytes: synthesis by group transfer polymerization and solution behavior , 1994 .

[31]  J. Israelachvili,et al.  Effect of pH and salt on the adsorption and interactions of an amphoteric polyelectrolyte , 1992 .

[32]  P. Higgs,et al.  Theory of polyampholyte solutions , 1991 .

[33]  G. J. Fleer,et al.  Adsorption of ions, polyelectrolytes and proteins. , 1991, Advances in colloid and interface science.

[34]  G. J. Fleer,et al.  Adsorption of weak polyelectrolytes on highly charged surfaces. Poly(acrylic acid) on polystyrene latex with strong cationic groups , 1990 .

[35]  A. Foissy,et al.  Adsorption of polyacrylic acid on titanium dioxide , 1983 .

[36]  F. Eirich.  The Conformational States of Macromolecules Adsorbed at Solid–Liquid Interfaces , 1977 .