NEUTRON REFLECTIVITY AND ELLIPSOMETRY STUDIES OF A POLYMER MOLECULAR LAYER SPREAD ON THE WATER-SURFACE
NEUTRON REFLECTIVITY AND ELLIPSOMETRY STUDIES OF A POLYMER MOLECULAR LAYER SPREAD ON THE WATER-SURFACE
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DOI：
10.1021/la00060a029
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发表时间：
1991-12-01
期刊：
影响因子：
3.9
通讯作者：
FARNOUX, B
中科院分区：
文献类型：
--
作者：
LEE, LT;MANN, EK;FARNOUX, B
我们用中子反射率技术研究了聚二甲基硅氧烷(PDMS)层在水的自由表面上的扩散。结合椭圆偏振实验的结果，证实了PDMS能够形成不同类型的稳定分子层。各层的密度约为第一层体相聚合物密度的0.85倍，并随着表面浓度C的增加而向体相密度方向演化。当C增加时，厚度通过离散的跳跃而演变，并保持与分子量无关。厚层难以铺展，相应的动力学也得到了研究。
We have studied poly(dimethylsiloxane) (PDMS) layers spread at the free surface of water by using neutron reflectivity techniques. The results together with previous data from ellipsometry experiments confirmed that PDMS is able to form different kinds of stable molecular layers. The density of the layers is about 0.85 times the bulk polymer density for the first layer and evolves toward the bulk density when the surface concentration C is increased. The thickness evolves via discrete jumps when C increases and remains independent of the molecular weight. Thick layers spread with difficulty and the corresponding kinetics has also been studied.