Regular Article

The European Physical Journal E

, 35:93

First online:

Strictly two-dimensional self-avoiding walks: Thermodynamic properties revisited

  • N. SchulmannAffiliated withInstitut Charles Sadron, Université de Strasbourg & CNRS
  • , H. XuAffiliated withLCP-A2MC, Institut Jean Barriol, Université de Lorraine & CNRS
  • , H. MeyerAffiliated withInstitut Charles Sadron, Université de Strasbourg & CNRS
  • , P. PolińskaAffiliated withInstitut Charles Sadron, Université de Strasbourg & CNRS
  • , J. BaschnagelAffiliated withInstitut Charles Sadron, Université de Strasbourg & CNRS
  • , J. P. WittmerAffiliated withInstitut Charles Sadron, Université de Strasbourg & CNRS Email author 

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Abstract

The density crossover scaling of various thermodynamic properties of solutions and melts of self-avoiding and highly flexible polymer chains without chain intersections confined to strictly two dimensions is investigated by means of molecular dynamics and Monte Carlo simulations of a standard coarse-grained bead-spring model. In the semidilute regime we confirm over an order of magnitude of the monomer density ρ the expected power law scaling for the interaction energy between different chains e int ρ 21/8, the total pressure Pρ 3 and the dimensionless compressibility gT = lim q→0 S(q) ∼ 1/ρ 2. Various elastic contributions associated to the affine and non-affine response to an infinitesimal strain are analyzed as functions of density and sampling time. We show how the size ξ(ρ) of the semidilute blob may be determined experimentally from the total monomer structure factor S(q) characterizing the compressibility of the solution at a given wave vector q . We comment briefly on finite persistence length effects.
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Keywords

Soft Matter: Polymers and Polyelectrolytes