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Surfaces of Semi-Fluorinated Block Copolymers Studied Using Nexafs

Published online by Cambridge University Press:  10 February 2011

J. Genzer ,
J. E. Sivaniah ,
E. J. Kramer ,
J. Wang ,
H. Körner ,
M.-L. Xiang ,
S. Yang ,
C. K. Ober ,
K. Char  and
M. K. Chaudhury
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J. Genzer
Affiliation:
Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106
J. E. Sivaniah
Affiliation:
Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106
E. J. Kramer
Affiliation:
Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106
J. Wang
Affiliation:
Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
H. Körner
Affiliation:
Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
M.-L. Xiang
Affiliation:
Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
S. Yang
Affiliation:
Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
C. K. Ober
Affiliation:
Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
K. Char
Affiliation:
Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
M. K. Chaudhury
Affiliation:
Department of Chemical Engineering, Lehigh University, Bethlehem, PA 18015
B. M. Dekoven
Affiliation:
Analytical Sciences Laboratory, The Dow Chemical Company, Midland, MI 48674
R. A. Bubeck
Affiliation:
Analytical Sciences Laboratory, The Dow Chemical Company, Midland, MI 48674
D. A. Fischer
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
S. Sambasivan
Affiliation:
National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 524: Symposium V – Application of Synchrotron Radiation Techniques…IV , 1998 , 365
Copyright
Copyright © Materials Research Society 1998

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References

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