Non-monotonic dependence of the rupture force in polymer chains on their lengths

Details Non-monotonic dependence of the rupture force in polymer chains on their lengths Non-monotonic dependence of the rupture force in polymer chains on their lengths

2009-02-09

arxiv.org/abs/0902.1424v1

Europhysics Letters 86, 28001 (2009)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1209/0295-5075/86/28001

We consider the rupture dynamics of a homopolymer chain pulled at one end at a constant loading rate. Our model of the breakable polymer is related to the Rouse chain, with the only difference that the interaction between the monomers is described by the Morse potential instead of the harmonic one, and thus allows for mechanical failure. We show that in the experimentally relevant domain of parameters the dependence of the most probable rupture force on the chain length may be non-monotonic, so that the medium-length chains break easier than the short and the long ones. The qualitative theory of the effect is presented.

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