Demixing of compact polymers chains in three dimensions

Details Demixing of compact polymers chains in three dimensions Demixing of compact polymers chains in three dimensions

2010-05-20

arxiv.org/abs/1005.3610v2

Physics

Condensed Matter

Statistical Mechanics

v2: Substantial revision. 7 pages and 7 figures. Introduction rewritten and expanded. Improved discussion of scaling arguments

Scientific paper

We present a Monte Carlo algorithm that provides efficient and unbiased sampling of polymer melts consisting of two chains of equal length that jointly visit all the sites of a cubic lattice with rod geometry L x L x rL and non-periodic (hard wall) boundary conditions. Using this algorithm for chains of length up to 40 000 monomers and aspect ratios 1 <= r <= 10, we show that in the limit of a large lattice the two chains phase separate. This demixing phenomenon is present already for r=1, and becomes more pronounced, albeit not perfect, as r is increased.

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