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arXiv 0902.1424cond-mat.softcond-mat.stat-mech
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polymer链断裂力与链长的非单调关系

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

S. Fugmann, I. M. Sokolov

摘要:

我们考虑了均聚物链在恒定加载速率下一端被拉伸时的断裂动力学。我们的易碎聚合物模型与劳斯链有关,唯一的区别是单体之间的相互作用由Morse势而不是谐波势描述,因此允许机械故障。我们表明,在实验相关的域的参数的依赖性的最可能的断裂力的链长度可能是非单调的,使中等长度的链比短和长的更容易打破。提出了该效应的定性理论。

英文摘要:

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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