Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-12-04
Physics
Condensed Matter
Soft Condensed Matter
9 pages, 7 figures, accepted for publication in EPJE
Scientific paper
10.1140/epje/i2007-10250-0
Following the Flory ideality hypothesis intrachain and interchain excluded volume interactions are supposed to compensate each other in dense polymer systems. Multi-chain effects should thus be neglected and polymer conformations may be understood from simple phantom chain models. Here we provide evidence against this phantom chain, mean-field picture. We analyze numerically and theoretically the static correlation function of the Rouse modes. Our numerical results are obtained from computer simulations of two coarse-grained polymer models for which the strength of the monomer repulsion can be varied, from full excluded volume (`hard monomers') to no excluded volume (`phantom chains'). For nonvanishing excluded volume we find the simulated correlation function of the Rouse modes to deviate markedly from the predictions of phantom chain models. This demonstrates that there are nonnegligible correlations along the chains in a melt. These correlations can be taken into account by perturbation theory. Our simulation results are in good agreement with these new theoretical predictions.
Baschnagel J"org
Beckrich P.
Farago Jean
Johner Albert
Kreer Torsten
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