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Phase Transitions of a Two-Dimensional Periodic Hydrophilic Hydrophobic Chain

Author

Listed:
  • Enzo Orlandini

    (Service de Physique Théorique, CE-Saclay, 91191 Gif-sur-Yvette Cedex, France)

  • Thomas Garel

    (Service de Physique Théorique, CE-Saclay, 91191 Gif-sur-Yvette Cedex, France)

Abstract

We study a single self-avoiding hydrophilic hydrophobic polymer chain, through Monte Carlo lattice simulations. The affinity of monomerifor water is characterized by a (scalar) chargeλi, and the monomer-water interaction is short-ranged. Assuming incompressibility yields an effective short ranged interaction between monomer pairs(i,j), proportional to(λi+ λj). In this article, we takeλi=+1(resp.(λi=-1)) for hydrophilic (resp. hydrophobic) monomers and consider a chain with (i) an equal number of hydrophilic and -phobic monomers (ii) a periodic distribution of theλialong the chain, with periodicity2p. This model may be of interest in various situations (protein folding, polysoaps, …) The simulations are done on the square lattice(d=2), for various chain lengthsN. There is a critical value(pc(N)~0.07N)of the periodicity, which distinguishes between different low temperature structures. Forp>pc, the ground state corresponds to a macroscopic phase separation between a dense hydrophobic core and hydrophilic loops. Forp

Suggested Citation

  • Enzo Orlandini & Thomas Garel, 1998. "Phase Transitions of a Two-Dimensional Periodic Hydrophilic Hydrophobic Chain," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 9(08), pages 1459-1468.
    • Handle: RePEc:wsi:ijmpcx:v:09:y:1998:i:08:n:s0129183198001321
    DOI: 10.1142/S0129183198001321
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