聚苯乙烯
润湿
量子纠缠
山脊
放松(心理学)
材料科学
离子液体
高分子化学
化学
化学物理
聚合物
复合材料
物理
有机化学
量子力学
催化作用
心理学
量子
古生物学
社会心理学
生物
作者
Fengliang Wang,Zhenwei Jiang,Xuanyu Lin,Cuiyun Zhang,Keiji Tanaka,Biao Zuo,Wei Zhang,Xinping Wang
出处
期刊:Macromolecules
[American Chemical Society]
日期:2021-04-16
卷期号:54 (8): 3735-3743
被引量:14
标识
DOI:10.1021/acs.macromol.1c00224
摘要
The thickness effect on the relaxation behavior and chain entanglements was investigated for thin polystyrene films. By following the time evolution of the wetting ridge at the surface induced by a droplet of ionic liquid, the characteristic time (τ*) at which the ridge height started to change was obtained. Here, we demonstrated experimentally that the characteristic time was associated with the disentanglement time τd, τ* ∼ τd ∼ Mw3.4/Me1.4, where Me denotes the entanglement molecular weight. The critical thickness (hc) at which τ* started to decrease was approximately 3.3Rg. That is, the Me increased, or the interchain entanglement density decreased, as the film became thinner than the hc. This might be explained in terms of the conformational change from "spherical" to "ellipsoidal", leading to a reduction in the pervaded volume (Vp) of chains in the ultrathin films.
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