How do grafting points influence the structure formation in binary and one-component polymer brushes?

Grafting of incompatible polymers onto a substrate one prevents macroscopic phase separation. Theory predicts a rich phase diagram of laterally periodic morphologies of brushes consisting of incompatible polymers or one-component brushes in a bad solvent, however, structures observed in experiments lack long-range periodic order. \\ We employ MC simulations of a coarse-grained model to investigate the influence of spatial correlations of the grafting points (patterns) onto the morphology of one component brushes in a bad solvent and binary brushes.

Comparing morphologies on identical sets of grafting point we observe a pronounced correlation between the average morphology of the brush and density fluctuations of the grafting points. These fluctuations prevent long-range ordering. Rather than a sharp thermodynamic transition, we observe a gradual building up of local structure upon increasing the incompatibility.

The structure formation occurs at smaller incompatibility and the length ... more.

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