Entropy of polydisperse chains: solution on the Bethe lattice

Details Entropy of polydisperse chains: solution on the Bethe lattice Entropy of polydisperse chains: solution on the Bethe lattice

2008-03-04

arxiv.org/abs/0803.0459v2

J. Chem. Phys. 128, 184904 (2008)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 2 figures. Reference placed

Scientific paper

10.1063/1.2918346

We consider the entropy of polydisperse chains placed on a lattice. In particular, we study a model for equilibrium polymerization, where the polydispersivity is determined by two activities, for internal and endpoint monomers of a chain. We solve the problem exactly on a Bethe lattice with arbitrary coordination number, obtaining an expression for the entropy as a function of the density of monomers and mean molecular weight of the chains. We compare this entropy with the one for the monodisperse case, and find that the excess of entropy due to polydispersivity is identical to the one obtained for the one-dimensional case. Finally, we obtain an exponential distribution of molecular weights.

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