Random Hydrophilic-Hydrophobic Copolymers

Details Random Hydrophilic-Hydrophobic Copolymers Random Hydrophilic-Hydrophobic Copolymers

1994-06-13

arxiv.org/abs/cond-mat/9406050v1

Physics

Condensed Matter

Saclay-T94/077 Email: orland@amoco.saclay.cea.fr

Scientific paper

10.1051/jp2:1994252

We study a single statistical amphiphilic copolymer chain AB in a selective solvent (e.g.water). Two situations are considered. In the annealed case, hydrophilic (A) and hydrophobic (B) monomers are at local chemical equilibrium and both the fraction of A monomers and their location along the chain can vary, whereas in the quenched case (which is relevant to proteins), the chemical sequence along the chain is fixed by synthesis. In both cases, the physical behaviour depends on the average hydrophobicity of the polymer chain. For a strongly hydrophobic chain (large fraction of B), we find an ordinary continuous $\theta$ collapse, with a large conformational entropy in the collapsed phase. For a weakly hydrophobic, or a hydrophilic chain, there is an unusual first-order collapse transition. In particular, for the case of Gaussian disorder, this discontinuous transition is driven by a change of sign of the third virial coefficient. The entropy of this collapsed phase is strongly reduced with respect to the $\theta$ collapsed phase. Email contact: orland@amoco.saclay.cea.fr

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