Rheological evidence for a dynamical crossover in polymer melts via nonequilibrium molecular dynamics
Rheological evidence for a dynamical crossover in polymer melts via nonequilibrium molecular dynamics
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DOI：
10.1103/physrevlett.85.1128
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发表时间：
2000-07-31
影响因子：
8.6
通讯作者：
Hess, S
中科院分区：
文献类型：
--
作者：
Kröger, M;Hess, S
一定的“临界”分子量控制着多珠有限可延伸非线性弹性 (FENE) 链模型聚合物熔体的流变性能。流变交叉表现为每链珠的临界数量 N-c = 100 +/- 10 时粘性性能的幂律行为的变化。这一发现证实了我们作为附带结果获得的新提出的无量纲临界重量、特征长度和柔韧性之间的关系。结果进一步表明，柔性 FENE 链模型的缠结分子量 N-e 在大小上可以与其临界分子量 N-c 相当，甚至更大。
A certain "critical" molecular weight controls rheological properties of the multibead finitely extensible nonlinear elastic (FENE) chain model polymer melt, The rheological crossover manifests itself in a change of power law behavior for the viscous properties at a critical number of beads per chain N-c = 100 +/- 10. This finding confirms a newly proposed relationship between dimensionless critical weight, characteristic length, and flexibility which we obtain as a side result. Results further suggest that the entanglement molecular weight N-e for the flexible FENE chain model could he comparable in size or even larger than its critical molecular weight N-c.