Interfacial properties of polystyrene thin films as revealed by neutron reflectivity.
Interfacial properties of polystyrene thin films as revealed by neutron reflectivity.
复制标题
DOI：
10.1103/physreve.84.031802
复制
发表时间：
2011-09
期刊：
影响因子：
--
通讯作者：
R. Inoue;K. Kawashima;K. Matsui;M. Nakamura;K. Nishida;T. Kanaya;N. Yamada
中科院分区：
文献类型：
--
作者：
R. Inoue;K. Kawashima;K. Matsui;M. Nakamura;K. Nishida;T. Kanaya;N. Yamada
采用中子反射法研究了表面氢化聚苯乙烯（h-PS）和底部氘代聚苯乙烯（d-PS）双层薄膜的玻璃化转变温度（T（g））和分子迁移率。随着底部d-PS层厚度的减小，聚合物薄膜和基底之间界面附近的T（g）与本体T（g）相比增加，并且对于<155 μ m厚的底部d-PS层观察到T（g）的急剧增加。聚合物链在界面处的取向与聚合物与基体界面附近T（g）的增加有关。聚合物链迁移率随厚度降低，即使对于底部d-PS层也是如此，T（g）没有明显变化。认为聚合物链与衬底之间的大量接触与聚合物薄膜与衬底之间界面附近的迁移率降低有关。
We have studied the glass transition temperature (T(g)) and molecular mobility of polystyrene (PS) thin films near the interface between the polymer thin film and substrate with bilayer thin films consisting of surface hydrogenated PS (h-PS) and bottom deuterated PS (d-PS) using neutron reflectivity. With decreasing the thickness of the bottom d-PS layer, T(g) near the interface between the polymer thin film and substrate increased compared to bulk T(g) and a drastic increase of T(g) was observed for the bottom d-PS layer <155 Å thick. The orientation of polymer chains at the interface is supposed to be related to the increase of T(g) near the interface between the polymer and substrate. The polymer chain mobility decreased with thickness even for the bottom d-PS layer with no discernible change of T(g). It is considered that the numerous contacts between polymer chains and substrate are related to the decrease of mobility near the interface between the polymer thin film and substrate.