Rheological predictions of network systems swollen with entangled solvent
Rheological predictions of network systems swollen with entangled solvent
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DOI：
10.1002/aic.14370
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发表时间：
2014-04-01
期刊：
影响因子：
3.7
通讯作者：
Schieber, Jay D.
中科院分区：
文献类型：
--
作者：
Katzarova, Maria;Andreev, Marat;Schieber, Jay D.
实验研究了交联聚二甲基硅氧烷（PDMS）网络与非反应性缠结PDMS溶剂溶胀后的力学性能。在本文中，我们使用离散的滑动链接模型来预测其线性和非线性流变。模型参数由纯溶剂的动态模量数据得到。网络流变学预测还需要估计网络中悬挂或无活性链的分数和结构，这是不可直接测量的。从动态模量测量估计活性链分数，并调整分子量以拟合动态模量数据。然后，非线性流变学可以预测没有调整。这些成功的预测有力地表明，所观察到的流变改性溶胀共混物中产生的网络链和悬挂端之间的约束动力学。(c)2014美国化学工程师学会AIChE J，60：1372-1380，2014我们将这篇文章献给R.拜伦·伯德在他90岁生日之际。我们试图遵循鲍勃的两个忠告，即数学上的严格性和实际相关性。
The mechanical properties of a cross-linked polydimethylsiloxane (PDMS) network swollen with nonreactive entangled PDMS solvent was previously studied experimentally. In this article, we use the discrete slip-link model to predict its linear and nonlinear rheology. Model parameters are obtained from the dynamic modulus data of pure solvent. Network rheology predictions also require an estimate of the fraction and architecture of dangling or inactive strands in the network, which is not directly measurable. The active strand fraction is estimated from dynamic modulus measurements, and the molecular weight is adjusted to fit the dynamic modulus data. Then, the nonlinear rheology can be predicted without adjustments. These successful predictions strongly suggest that the observed rheological modification in the swollen blend arises from the constraint dynamics between the network chains and the dangling ends. (c) 2014 American Institute of Chemical Engineers AIChE J, 60: 1372-1380, 2014We dedicate this article to Prof. R. Byron Bird on the occasion of his 90th birthday. We attempt to follow the twin exhortations of Bob to be both mathematically rigorous and practically relevant.