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Time-Resolved X-Ray Diffraction from Liquid Crystalliine Systems: Thermotropic Phase Transitions and the Effect of Applied Electric Fields

Published online by Cambridge University Press:  25 February 2011

Scott G. Mcnamee ,
G. Galli  and
C. K. Ober
Scott G. Mcnamee
Affiliation:
Comell University, Dept. of Materials Science and Eng., Ithaca, NY 14850
G. Galli
Affiliation:
University of Pisa, Department of Industrial and Organic Chemistry, Pisa, Italy
C. K. Ober
Affiliation:
Comell University, Dept. of Materials Science and Eng., Ithaca, NY 14850
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Abstract

Time resolved X-ray diffraction from thermotropic liquid crystalline (LC) materials has been studied in conjunction with standard LC characterization techniques to investigate phase transitions and alignment due to applied electric fields. A more detailed understanding of the kinetics of the interaction between LC systems and applied fields is being sought. Both the effect of electric fields on the inter-molecular structure and the orientation parameter have been evaluated as a function of temperature for LC model compounds. These results are compared to observations of these mesogens in applied electric fields using optical microscopy. Materials of interest include low molar mass distyrylbenzene mesogens which exhibit both nematic and smectic mesophases. Results of investigations of thermotropic polymers will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 101
Copyright
Copyright © Materials Research Society 1992

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References

1. Ober, C. K., Delvin, A. and Bluhm, T. L., J. Polym. Sci. Part B 2., 1047 (1990).Google Scholar
2. Delvin, A., Ober, C. K. and Bluhm, T. L., Macromolecules 22, 498 (1989); in Polymeric Materials Science and Engineering, Proc. Am. Chem. Soc., Div. Polym. Sci.:Sci. & Eng., Washington, DC meeting, 58, 1029 (1988).Google Scholar
3. Mates, T. and Ober, C. K., in Materials for Nonlinear Optics, edited by Marder, S.R., Sohn, J.E. and Stucky, G. D. (ACS Symposium Series 455, American Chemical Society, Washington, DC 1991) pp. 497–515.CrossRefGoogle Scholar
4. Angelopoulos, E., Ober, C. K. and Kramer, E. J., Proc. ACS Div. Polym. Mat.: Sci. & Eng., 63, 450 (1990).Google Scholar
5. Haase, W., in Side Chain Liquid Crystalline Polymers, edited by McArdle, C.B. (Chapman and Hall, New York, 1989), p. 317.Google Scholar