Surface structure of asymmetric fluorinated block copolymers

Hideaki Yokoyama, Keiji Tanaka, Atsushi Takahara, Tisato Kajiyama, Kenji Sugiyama, Akira Hirao

研究成果: Contribution to journalArticle査読

51 被引用数 (Scopus)

抄録

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, fPFwt, 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 fPFwt 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 group. However, as fPFwt goes beyond 0.3, the backbone of the PF block orients toward the surface while the top surface region, i.e., 1.5 nm from the surface, is still occupied by the C8F17 side groups standing perpendicular to the surface.

本文言語英語
ページ(範囲)939-945
ページ数7
ジャーナルMacromolecules
37
3
DOI
出版ステータス出版済み - 2 10 2004

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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