A Nanorheological Study of Adsorbed Polymer Layers
A Nanorheological Study of Adsorbed Polymer Layers
复制标题
吸附聚合物层的纳米流变研究
DOI：
10.1021/ma961186i
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发表时间：
1997
期刊：
影响因子：
5.5
通讯作者：
S. Manimaaran
中科院分区：
文献类型：
--
作者：
P. Luckham;S. Manimaaran
本文提出了一种确定压缩下吸附聚合物层粘弹性的方法。该技术允许在纳米尺度上测量流变特性，并围绕使用为此目的专门修改的表面力装置（SFA）而展开。通过对一个云母表面施加振荡运动并监测第二个限制表面对此运动的响应来进行实验。两个表面之间的运动耦合是间隙中材料的特征，并且允许将材料的粘弹性特性确定为其限制的函数。开发这种技术的目的是弥合从表面力测量获得的纳米（平衡）视图与从传统流变测量获得的宏观（动态）视图之间的差距。本文介绍了在甲苯中的 PEO/PS 系统和在十氢萘溶剂中的 PMMA/PHSA 系统获得的结果。结果表明，系统的行为发生了显着变化，从聚合物重叠处以粘性为主转变为存在重叠处以弹性为主。
In this paper, a means of determining the viscoelastic properties of adsorbed polymer layers under compression is presented. The technique allows rheological properties to be measured on a nanoscopic scale, and revolves around the use of a Surface Force Apparatus (SFA) that has been specially modified for such a purpose. The experiments were carried out by applying an oscillatory motion to one mica surface and monitoring the response of the second confining surface to this motion. The coupling of the motion between the two surfaces is characteristic of the material in the gap and allows the viscoelastic properties of the material to be determined as a function of its confinement. In developing such a technique, the aim was to bridge the gap between the nanoscopic (equilibrium) view obtained from surface force measurements and the macroscopic (dynamic) view obtained from traditional rheological measurements. Results obtained on a PEO/PS system in toluene and a PMMA/PHSA system in a decahydranaphthalene solvent are presented here. The results indicate a significant change in the behavior of the system from being predominantly viscous away from polymer overlap to being predominantly elastic where there is overlap.