Residual entropy in a model for the unfolding of single polymer chains

Details Residual entropy in a model for the unfolding of single polymer chains Residual entropy in a model for the unfolding of single polymer chains

2007-04-10

arxiv.org/abs/0704.1233v3

EPL 81, 28007 (2008)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 4 figures, extended version of arXiv:cond-mat/0612256

Scientific paper

10.1209/0295-5075/81/28007

We study the unfolding of a single polymer chain due to an external force. We use a simplified model which allows to perform all calculations in closed form without assuming a Boltzmann-Gibbs form for the equilibrium distribution. Temperature is then defined by calculating the Legendre transform of the entropy under certain constraints. The application of the model is limited to flexible polymers. It exhibits a gradual transition from compact globule to rod. The boundary line between these two phases shows reentrant behavior. This behavior is explained by the presence of residual entropy.

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