Collapse of Randomly Self-Interacting Polymers

Abstract

We use complete enumeration and Monte Carlo techniques to study self--avoiding walks with random nearest--neighbor interactions described by $v_0{q}_i{q}_j$, where $q_i=\pm 1$ is a quenched sequence of ``charges'' on the chain. For equal numbers of positive and negative charges ($N_{+}=N_{-}$), the polymer with $v_0>0$ undergoes a transition from self--avoiding behavior to a compact state at a temperature $\theta \approx 1.2v_0$. The collapse temperature $\theta (x)$ decreases with the asymmetry $x=|N_{+}-N_{-}|/(N_{+}+N_{-})$

8 pages, TeX, 4 uuencoded postscript figures, MIT-CMT-2

References in corpus (1)

• Excess Charge in Polyampholytes

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• Two-Dimensional Polymers with Random Short-Range Interactions
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• From Collapse to Freezing in Random Heteropolymers
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• Theta-point universality of polyampholytes with screened interactions
• Glassy phases in Random Heteropolymers with correlated sequences
• Conformational transitions in random heteropolymer models