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Surfaces of Semi-Fluorinated Block Copolymers Studied Using Nexafs

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Abstract

The molecular orientation within a surface liquid crystalline layer made up of semifluorinated side-groups [-CO-(CH2)x−x-(CF2)yF] (SF groups) attached to the isoprene block of a styrene-isoprene diblock copolymer was determined by analyzing the partial electron yield Cedge NEXAFS signal. The results show that in contrast to the bulk, where the SF groups lie parallel to the diblock copolymer lamellae and thus parallel to the surface, the surface SF groups make an average angle with the surface normal of between 29 and 46° depending on x and y.

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Authors and Affiliations

  1. Materials Department, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA

    J. Genzer, J. E. Sivaniah & E. J. Kramer

  2. Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA

    J. Wang, H. Körner, M. L. Xiang, S. Yang, C. K. Ober & K. Char

  3. Department of Chemical Engineering, Lehigh University, Bethlehem, PA, 18015, USA

    M. K. Chaudhury

  4. Analytical Sciences Laboratory, The Dow Chemical Company, Midland, MI, 48674, USA

    B. M. Dekoven & R. A. Bubeck

  5. National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA

    D. A. Fischer

  6. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY, 11973, USA

    D. A. Fischer & S. Sambasivan

Authors
  1. J. Genzer
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  2. J. E. Sivaniah
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  3. E. J. Kramer
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  4. J. Wang
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  5. H. Körner
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  6. M. L. Xiang
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  7. S. Yang
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  8. C. K. Ober
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  9. K. Char
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  10. M. K. Chaudhury
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  11. B. M. Dekoven
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  12. R. A. Bubeck
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  13. D. A. Fischer
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  14. S. Sambasivan
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Genzer, J., Sivaniah, J.E., Kramer, E.J. et al. Surfaces of Semi-Fluorinated Block Copolymers Studied Using Nexafs. MRS Online Proceedings Library 524, 365–370 (1998). https://doi.org/10.1557/PROC-524-365

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  • DOI: https://doi.org/10.1557/PROC-524-365

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