arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0803.0459cond-mat.stat-mechcond-mat.soft
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多分散链的熵:Bethe格上的解

Entropy of polydisperse chains: solution on the Bethe lattice

Minos A. Neto, Jürgen F. Stilck

摘要:

本文研究了格点上多分散链的熵。特别是,我们研究了一个模型的平衡聚合,其中的多分散性是由两个活动,内部和端点的链单体。我们解决了这个问题,正是在任意配位数的Bethe格,得到的熵作为一个函数的密度的单体和平均分子量的链的表达式。我们比较这个熵的单分散的情况下,并发现,由于多分散性的熵的过剩是相同的一维情况下获得的。最后,我们得到一个指数分布的分子量。

英文摘要:

We consider the entropy of polydisperse chains placed on a lattice. In particular, we study a model for equilibrium polymerization, where the polydispersivity is determined by two activities, for internal and endpoint monomers of a chain. We solve the problem exactly on a Bethe lattice with arbitrary coordination number, obtaining an expression for the entropy as a function of the density of monomers and mean molecular weight of the chains. We compare this entropy with the one for the monodisperse case, and find that the excess of entropy due to polydispersivity is identical to the one obtained for the one-dimensional case. Finally, we obtain an exponential distribution of molecular weights.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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