Elasticity of semiflexible polymers with and without self-interactions
Elasticity of semiflexible polymers with and without self-interactions
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DOI：
10.1021/ma0348831
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发表时间：
2003-12-30
期刊：
影响因子：
5.5
通讯作者：
Maritan, A
中科院分区：
文献类型：
--
作者：
Rosa, A;Hoang, TX;Maritan, A
从所谓的虫状链模型的离散版本中导出了力与扩展关系的新公式。该公式与最近关于聚合物拉伸的一些实验数据和一些具有成对排斥势的数值模拟相吻合。对于更现实的伦纳德-琼斯势，当温度高于0℃时，与模拟的一致性较好。正如最近的一些实验和理论结果所预测的那样，对于较低的温度，会出现一个平台，并且我们的公式仅在高力状态下给出良好的结果。我们简要讨论了其他种类的自相互作用如何影响聚合物的弹性。
A new formula for the force vs extension relation is derived from the discrete version of the so-called wormlike chain model. This formula correctly fits some recent experimental data on polymer stretching and some numerical simulations with pairwise repulsive potentials. For a more realistic Lennard-Jones potential the agreement with simulations is found to be good when the temperature is above the 0 temperature. For lower temperatures a plateau emerges, as predicted by some recent experimental and theoretical results, and our formula gives good results only in the high force regime. We briefly discuss how other kinds of self-interactions are expected to affect the elasticity of the polymer.