Localization of a multiblock copolymer at a selective interface: Scaling predictions and Monte Carlo verification

Details Localization of a multiblock copolymer at a selective interface: Scaling predictions and Monte Carlo verification Localization of a multiblock copolymer at a selective interface: Scaling predictions and Monte Carlo verification

2004-11-16

arxiv.org/abs/cond-mat/0411402v1

J. Chem. Phys. 122, 094907 (2005)

Physics

Condensed Matter

Soft Condensed Matter

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

Scientific paper

10.1063/1.1854133

We investigate the localization of a hydrophobic - polar (HP) - regular copolymer at a selective solvent-solvent interface with emphasis on the impact of block length $M$ on the copolymer behavior. The considerations are based on simple scaling arguments and use the mapping of the problem onto a homopolymer adsorption problem. The resulting scaling relations treat the gyration radius of the copolymer chain perpendicular and parallel to the interface in terms of chain length N and block size M, as well as the selectivity parameter \chi . The scaling relations differ for the case of weak and strong localization. In the strong localization limit a scaling relation for the lateral diffusion coefficient D is also derived. We implement a dynamic off-lattice Monte - Carlo model to verify these scaling predictions. For chain lengths in a wide range (32 < N < 512) we find good agreement with the scaling predictions.

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