## Abstract

We study concentrated solutions of ideal A-B symmetric random copolymers in non-selective good solvents by computer simulations. When the effective net A-B interaction per thermal energy in the solution (χ_{eff}) is larger than 2, the scattering function has a peak at a molecular weight (N) independent wave vector k* ≠ 0. We find a certain characteristic cell size l < 1/k* below which the distribution of local monomer densities within the system is flat, i.e. the probability of finding a cell with an A monomer density ρ_{A} is uniform over a broad range of ρ_{A} values. We observe solvent enrichment in cells where ρ_{A} ∼ ρ_{B} and solvent depletion in cells which are either A or B rich. The chains dynamics for all N studied (up to N = 64) are Rouse-like regardless of the value of χ_{eff}. When reptation dynamics are imposed, the diffusion of the center of mass decreases substantially as χ_{eff} increases, suggesting that long chains are quasi-frozen.

Original language | English (US) |
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Pages (from-to) | 487-492 |

Number of pages | 6 |

Journal | Europhysics Letters |

Volume | 35 |

Issue number | 7 |

DOIs | |

State | Published - Sep 1 1996 |

## ASJC Scopus subject areas

- Physics and Astronomy(all)