Volume 42, Number 1, April 1998
|Page(s)||97 - 102|
|Section||Cross-disciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Stretching a heteropolymer
Laboratoire de Physique Statistique de
Laboratoire associé au CNRS et
aux universités Paris VI et VII.) ,
24 rue Lhomond, 75231 Paris Cedex 05, France
2 Department of Complex Systems, Weizmann Institute, Rehovoth, Israel
3 Department of Physics, University of Rabat, Rabat, Morocco
4 Laboratoire de Physique Théorique de l'ENS (Laboratoire propre du CNRS, associé à l'ENS et à l'Université de Paris XI.) , 24 rue Lhomond, 75231 Paris Cedex 05, France
Accepted: 13 February 1998
We study the influence of some quenched disorder in the sequence of monomers on the entropic elasticity of long polymeric chains. Starting from the Kratky-Porod model, we show numerically that some randomness in the favoured angles between successive segments induces a change in the elongation vs. force characteristics, and this change can be well described by a simple renormalisation of the elastic constant. The effective coupling constant is computed by an analytic study of the low-force regime.
PACS: 87.15.By – Structure, bonding, conformation, configuration, and isomerism of biomole cules / 61.41.+e – Polymers, elastomers, and plastics
© EDP Sciences, 1998
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