Normal Modes and Dielectric Spectra of Diblock Copolymers in Lamellar Phases
Normal Modes and Dielectric Spectra of Diblock Copolymers in Lamellar Phases
复制标题
层状二嵌段共聚物的简正模和介电谱
DOI：
10.1021/acs.macromol.5b02721
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发表时间：
2016
期刊：
影响因子：
5.5
通讯作者：
V. Ganesan
中科院分区：
文献类型：
--
作者：
Vaidyanathan Sethuraman;V. Pryamitsyn;V. Ganesan
我们用分子动力学模拟方法研究了两嵌段共聚物在层状相中的简正模动力学和频率相关介电弛豫谱。与以往依赖于Rouse模适用性的工作不同，我们对平行和垂直于片层平面方向的有序相中的链动力学进行了显式简正模分析。我们考虑了两个模型来分离由形态有序和区块之间的迁移率差异引起的特定影响。对于块之间没有迁移率差异的系统，我们的分析表明，在平行和垂直于薄层的平面上的简正模及其驰豫动力学都表现出与Rouse模的偏差。对于其中一个嵌段的迁移率冻结在片层相中的体系，简正波模式与系留聚合物的Rouse模式非常相似。然而，这些模式的松弛动力学表现出偏差。
We use molecular dynamics simulations to study the normal mode dynamics and frequency dependent dielectric relaxation spectra of diblock copolymers in lamellar phases. In contrast to previous works which have relied on the applicability of Rouse modes, we effect an explicit normal-mode analysis of the chain dynamics in the ordered phases in the directions parallel and perpendicular to the lamellar plane. We considered two models to isolate the specific effects arising from the morphological ordering and mobility disparities between the blocks. For systems with no mobility disparity between the blocks, our analysis demonstrates that both the normal modes and their relaxation dynamics in the planes parallel and perpendicular to the lamella exhibit deviations from the Rouse modes. For systems in which the mobility of one of the blocks was frozen in the lamellar phase, the normal modes closely resembled the Rouse modes for tethered polymers. However, the relaxation dynamics of such modes exhibited deviations ...
影响因子：
8.6
作者：
Glaser, Jens;Medapuram, Pavani;Morse, David C.
通讯作者：
Morse, David C.
影响因子：
3.4
作者：
Glaser, Jens;Qin, Jian;Morse, David C.
通讯作者：
Morse, David C.