Inoue Rintaro, Kanaya Toshiji, Nishida Koji, Tsukushi Itaru, Shibata Kaoru
Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Mar;77(3 Pt 1):032801. doi: 10.1103/PhysRevE.77.032801. Epub 2008 Mar 14.
In previous papers, we found that the mean square displacement [u(2)] in polystyrene thin films decreased with film thickness and discussed two possible causes for the decrease. One is the hard interface layer between the polymer thin film and the substrate, and the other is the spatial confinement effect of polymer chains. In order to disclose the cause of the decrease of [u(2)] with film thickness, we studied the molecular weight M(w) dependence of [u(2)] in polystyrene thin films. We found that [u(2)] was independent of M(w) within experimental error, concluding that the interface effect is a main reason for the decrease of [u(2)] with film thickness.
在之前的论文中，我们发现聚苯乙烯薄膜中的均方位移[u(2)]随薄膜厚度减小，并讨论了导致这种减小的两种可能原因。一种是聚合物薄膜与基底之间的硬界面层，另一种是聚合物链的空间限制效应。为了揭示[u(2)]随薄膜厚度减小的原因，我们研究了聚苯乙烯薄膜中[u(2)]对分子量M(w)的依赖性。我们发现在实验误差范围内[u(2)]与M(w)无关，得出界面效应是[u(2)]随薄膜厚度减小的主要原因的结论。
