RELAXATION OF RANDOMLY CROSS-LINKED POLYMER MELTS
RELAXATION OF RANDOMLY CROSS-LINKED POLYMER MELTS
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DOI：
10.1103/physrevlett.67.3531
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发表时间：
1991-12-16
影响因子：
8.6
通讯作者：
GREST, GS
中科院分区：
文献类型：
--
作者：
DUERING, ER;KREMER, K;GREST, GS
采用分子动力学模拟方法研究了远高于硫化阈值的随机交联聚合物熔体的动力学特性。考虑了链的中间和末端单体的均方位移以及交联。计算了中子自旋回波测量的动态散射函数S（q,t）。两个交联体之间的平均链长约为未交联体缠结长度的1/4。通过引入新的单体间电位，我们可以明确地测试捕获纠缠的影响。对于目前的系统，冻结缠结使平台模量改变了约25%。
The dynamical properties of randomly cross-linked polymer melts, far above the vulcanization threshold, are studied using molecular-dynamics simulations. The mean-square displacements of the middle and end monomers of the chains as well as the cross-links are considered. The dynamic scattering function S(q,t) as measured by neutron spin echoes is also calculated. The average strand length between two cross-links is about 1/4 of the entanglement length of the un-cross-linked melt. By introducing a new intermonomer potential, we can explicitly test the influence of trapped entanglements. For the present system, the frozen entanglements change the plateau modulus by about 25%.