Film Thickness Dependence of the Surface Structure of Immiscible Polystyrene/Poly(methyl methacrylate) Blends
Film Thickness Dependence of the Surface Structure of Immiscible Polystyrene/Poly(methyl methacrylate) Blends
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DOI：
10.1021/ma951140
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发表时间：
1996-04
期刊：
影响因子：
5.5
通讯作者：
Keiji Tanaka;A. Takahara;T. Kajiyama
中科院分区：
文献类型：
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作者：
Keiji Tanaka;A. Takahara;T. Kajiyama
利用原子力显微镜和X射线光电子能谱研究了不互溶聚苯乙烯/聚甲基丙烯酸甲酯（PS/PMMA）薄膜的表面结构与膜厚的关系。对于25 μm厚的PS/PMMA薄膜，由于其表面自由能低于PMMA，空气-聚合物界面区域被一层富含PS的覆盖层覆盖，并且在体相中形成了一个清晰的宏观相分离结构。此外，在100 nm厚度的PS/PMMA薄膜的情况下，在膜表面处形成相分离结构，其中富含PMMA的域从富含PS的基质中分离出来。PS/PMMA薄膜的表面结构的形成可以归因于由于溶剂分子的相当快的蒸发而在形成富含PS的覆盖层之前在空气-聚合物界面区域冻结的链构象或链聚集结构。另一方面，H…
The film thickness dependence of surface structure for immiscible polystyrene/poly(methyl methacrylate) (PS/PMMA) films was investigated on the basis of atomic force microscopic observation and X-ray photoelectron spectroscopic measurement. In the case of the PS/PMMA film of 25 μm thickness, the air−polymer interfacial region was covered with a PS rich overlayer due to its lower surface free energy compared with that of PMMA and a well-defined macroscopic phase-separated structure was formed in the bulk phase. Also, in the case of the PS/PMMA thin film of 100 nm thickness, the phase-separated structure, in which the PMMA rich domains separated out of the PS rich matrix, formed at the film surface. The formation of the surface structure for the PS/PMMA thin film can be attributed to either the chain conformation or chain aggregation structure being frozen at the air−polymer interfacial region before the formation of a PS rich overlayer due to the fairly fast evaporation of solvent molecules. On the other h...