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APS -APS March Meeting 2017 - Event - Impact of substrate roughness on the segmental mobility of thin polymer films.

机译:APS -APS 2017年3月会议-活动-基材粗糙度对聚合物薄膜分段迁移率的影响。

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We have investigated the impact of substrate roughness on the segmental mobility of spincasted thin films of different polymers. In neat disagreement with predictions of molecular dynamics simulations of the structural relaxation of Lennard-Jones liquids [1], segmental dynamics does not slow-down upon increase of the roughness of the substrate on which polymer layer is deposited. Our results indicate, on the contrary, an enhancement in segmental mobility with interfacial roughness, proportional to the sensitivity of the polymer to a perturbation in volume. In line with current literature, we deduce that the reduction in relaxation time with increasing roughness implies an excess in interfacial free volume, probably caused by partial wetting at the polymer/substrate interface. [1] P Scheidler, W. Kob and K. Binder, Europhys. Lett. 59, 701 (2002)
机译:我们已经研究了基底粗糙度对不同聚合物的旋铸薄膜的分段迁移率的影响。与Lennard-Jones液体[1]的结构弛豫的分子动力学模拟的预测完全不同,分段动力学不会随着沉积有聚合物层的基材粗糙度的增加而减慢。相反,我们的结果表明,随着界面粗糙度的增加,分段流动性增强,与聚合物对体积扰动的敏感性成正比。与现有文献一致,我们推断随着粗糙度增加弛豫时间的减少暗示界面自由体积过多,这可能是由于聚合物/基材界面处的部分润湿所致。 [1] P Scheidler,W。Kob和K.Binder,Europhys。来吧59,701(2002)

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