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首页> 外文期刊>Macromolecular theory and simulations >Rejuvenation, Aging, and Confinement Effects in Atactic-Polystyrene Films Subjected to Oscillatory Shear
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Rejuvenation, Aging, and Confinement Effects in Atactic-Polystyrene Films Subjected to Oscillatory Shear

机译:振荡剪切作用下无规立构聚苯乙烯薄膜的修复,老化和封闭效应

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摘要

Molecular-dynamics simulations of 5 nm-thick atactic-polystyrene films have been used to study the influence of cyclic-shear deformation on the stress–strain behavior and local segmental mobility. Upon cyclic yield the stress–strain behavior of the films slowly evolves towards a steady state which is characterized by a decrease of the maximum stress and by an enhanced dissipative process. Immediately after plastic deformation the storage modulus is decreased and the loss modulus is increased as compared with their initial values. Such changes in the viscoelastic moduli reflect the mechanical rejuvenation of a polymer glass. This mechanical rejuvenation of polymers is connected to the increase in the simulated segmental mobility, which is calculated for the entire film as well as in different layers.
机译:5 nm厚的无规立构聚苯乙烯薄膜的分子动力学模拟已用于研究循环剪切变形对应力-应变行为和局部节段迁移率的影响。循环屈服后,薄膜的应力-应变行为逐渐演变成稳态,其特征是最大应力的降低和耗散过程的增强。与它们的初始值相比,塑性变形后,储能模量立即降低,损耗模量增加。粘弹性模量的这种变化反映了聚合物玻璃的机械再生。聚合物的这种机械复兴与模拟的分段迁移率的增加有关,这是针对整个薄膜以及不同层的计算得出的。

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