Exclusion Zone of Convex Brushes in the Strong-Stretching Limit

Details Exclusion Zone of Convex Brushes in the Strong-Stretching Limit Exclusion Zone of Convex Brushes in the Strong-Stretching Limit

2004-04-02

arxiv.org/abs/cond-mat/0404034v1

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 4 figures, submitted to J. Chem. Phys

Scientific paper

10.1063/1.1778153

We investigate asymptotic properties of long polymers grafted to convex cylindrical and spherical surfaces, and, in particular, distribution of chain free ends. The parabolic potential profile, predicted for flat and concave brushes, fails in convex brushes, and chain free ends span only a finite fraction of the brush thickness. In this paper, we extend the self-consistent model developed by Ball, Marko, Milner and Witten to determine the size of the exclusion zone, i.e. size of the region of the brush free from chain ends. We show that in the limit of strong stretching, the brush can be described by an alternative system of integral equations. This system can be solved exactly in the limit of weakly curved brushes, and numerically for the intermediate to strong curvatures. We find that going from melt state to theta solvent and then to marginal solvent decreases relative size of the exclusion zone. These relative differences grow exponentially as the curvature decreases to zero.

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