Oppositely charged polyelectrolytes grafted onto planar surface: Mean-field lattice theory |
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Authors: | NP Shusharina P Linse |
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Institution: | (1) Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden, SE |
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Abstract: | Equilibrium structures of planar polyelectrolyte brushes formed by grafted chains carrying charges of opposite sign are examined
by employing mean-field lattice theory. Two brushes of different architecture are considered: one formed by grafted diblock
copolymers with oppositely charged blocks and the other being a mixed brush composed of oppositely charged homopolymers. The
systems display nontrivial intrinsically inhomogeneous brush structures originating from the chain connectivity and the electrostatic
interaction among the segments. In addition, a coexistence of stretched and coiled chains inside the brush is observed. The
influence of the charges of the blocks, the relative length of the oppositely charged blocks, and the ionic strength of the
solution on the brush inhomogeneity and structural differences between the two types of brushes are discussed.
Received 14 March 2001 and Received in final form 18 June 2001 |
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Keywords: | PACS 36 20 -r Macromolecules and polymer molecules – 82 65 +r Surface and interface chemistry – 07 05 Tp Computer modeling and simulation |
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