Non-ideal behavior of intramolecular structure factor of dilute polymers in a theta solvent

Details Non-ideal behavior of intramolecular structure factor of dilute polymers in a theta solvent Non-ideal behavior of intramolecular structure factor of dilute polymers in a theta solvent

2009-09-11

arxiv.org/abs/0909.2125v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 7figures

Scientific paper

We study the configurational properties of single polymers in a theta solvent by Monte Carlo simulation of the bond fluctuation model. The intramolecular structure factor at the theta point is found to be distinctively different from that of the ideal chain. The structure factor shows a hump around $q\sim 5/R_g$ and a dip around $q\sim 10/R_g$ in the Kratky plot with $R_g$ being the radius of gyration. This feature is apparently similar to that in a melt. The theoretical expression by the simple perturbation expansion to the first order in terms of the Mayer function can be fitted to the obtained structure factor quite well, but the second virial coefficient cannot be set to zero.

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