Surface Structure of Asymmetric Fluorinated Block Copolymers
Surface Structure of Asymmetric Fluorinated Block Copolymers
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DOI：
10.1021/ma035191f
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发表时间：
2004-02
期刊：
影响因子：
5.5
通讯作者：
Hideaki Yokoyama;Keiji Tanaka;A. Takahara;T. Kajiyama;K. Sugiyama;A. Hirao
中科院分区：
文献类型：
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作者：
Hideaki Yokoyama;Keiji Tanaka;A. Takahara;T. Kajiyama;K. Sugiyama;A. Hirao
用X射线光电子能谱（XPS）和动态二次离子质谱（西姆斯）研究了不对称聚[苯乙烯-嵌段-4-（全氟辛基丙氧基）苯乙烯]嵌段共聚物（PS-PF）的表面结构.嵌段共聚物的氟辛基侧基（C8 F17）由于它们的低表面能而分离到表面。嵌段的不对称性显著影响了C8 F17侧基的结构和PS−PF共聚物表面的主链。当PF嵌段的重量分数为0.09时，表面部分地被C8 F17侧基覆盖，其厚度比C8 F17侧基的长度薄。因此C8 F17侧基平行于表面。当约为0.25时，PF嵌段的主链平行于表面，并且C8 F17侧基垂直于表面。这种构象导致PF嵌段的畴厚度与C8 F17侧链的长度相当。
Surface structures of asymmetric poly[styrene-block-4-(perfluorooctylpropyloxy)styrene] block copolymers (PS−PF) with the shorter PF block than the PS block have been investigated using X-ray photoelectron spectroscopy (XPS) and dynamic secondary ion mass spectrometry (SIMS). Fluorooctyl side groups (C8F17) of the block copolymers segregate to the surface due to their low surface energy. Asymmetry of the block remarkably influences the structure of the C8F17 side groups and the backbone of PS−PF copolymers at the surface. When a weight fraction of the PF block, , is 0.09, the surface is partially covered by the C8F17 side groups with a thickness thinner than the length of the C8F17 side group. The C8F17 side groups hence lie parallel to the surface. When is approximately 0.25, the backbone of the PF block lies parallel to the surface, and the C8F17 side groups stand perpendicular to the surface. Such a conformation results in a domain thickness of the PF block comparable to the length of the C8F17 side gr...