Stretching self-interacting, partially directed, flexible and semi-flexible polymers by an external force

Abstract

We study the model of a partially directed flexible or semi-flexible homopolymer on a square lattice, subject to an externally applied force, in a direction either parallel to, or perpendicular to the preferred direction. The polymer is self-interacting and can therefore undergo a collapse transition. We show that this model can be solved and we obtain the force-temperature phase diagrams which, for the case of flexible polymers, agree with that of Brak et al obtained using a different method. At sufficiently low temperatures, the polymer conformation changes from compact to coil state as the force is increased beyond a critical value. This transition is second or first order for the completely flexible or semi-flexible polymer, respectively.

17 pages, 8 figures

References in corpus (11)

• Collapse Transition of Two-Dimensional Flexible and Semiflexible Polymers
• Stretching Polymers in Poor and Bad Solvents: Pullout Peaks and an Unraveling Transition
• Mechanical unfolding of directed polymers in a poor solvent: novel critical exponents
• Stretching of a single-stranded DNA: Evidence for structural transition
• Force induced conformational transition in a system of interacting stiff polymer: Application to unfolding
• Force induced stretched state: Effects of temperature
• A self-interacting partially directed walk subject to a force
• Pulling self-interacting polymers in two-dimensions
• Role of pulling direction in understanding the energy landscape of proteins
• Exact Solution of Semi-Flexible and Super-Flexible Interacting Partially Directed Walks
• Adsorption of Externally Stretched Two-Dimensional Flexible and Semi-flexible Polymers near an Attractive Wall