Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-04-24
Phys. Rev. E 72, 052901 (2005)
Physics
Condensed Matter
Soft Condensed Matter
RevTeX v4, 9 pages with 6 eps figures
Scientific paper
We consider a stiff polymer chain in poor solvent and apply a force at one end of the chain. We find that by varying the stiffness parameter, polymer undergoes a transition from the globule state to the folded like state. The conformation of folded state mimics the $\beta$-sheet as seen in titin molecule. Using exact enumeration technique, we study the extension-force and force-temperature diagrams of such a system. Force-temperature diagram shows the re-entrance behaviour for flexible chain. However, for stiff chain this re-entrance behaviour is absent and there is an enhancement in $\theta$-temperature with the rise of stiffness. We further propose that the internal information about the frozen structure of polymer can be read from the distribution of end-to-end distance which shows saw-tooth like behaviour.
Giri Debaprasad
Kumar Sanjay
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