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Semifluorinated Polymeric Liquid Crystals as A Mechanistic Tool to Study The Effects of Interfacial Energies on The Orientation of Liquid Crystals

Published online by Cambridge University Press:  15 March 2011

Dvora Perahia ,
Rakchart Traiphol  and
Dennis W. Smith
Dvora Perahia
Affiliation:
Clemson University, Department of Chemistry and MS&E Program, Clemson, SC 29634-0973
Rakchart Traiphol
Affiliation:
Clemson University, Department of Chemistry and MS&E Program, Clemson, SC 29634-0973
Dennis W. Smith
Affiliation:
Clemson University, Department of Chemistry and MS&E Program, Clemson, SC 29634-0973
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Abstract

Obtaining spontaneous orientation and fast collective response of ultra thin liquid crystalline (LC) layers to external stimuli without memory effects, is one of the major challenges in achieving the next generation of LC devices. The relationship between interfacial energies, structure and dynamics of support layers and their effects on surface orientation of liquid crystals has been investigated. A model polymeric system, containing a mesognic group, α- methylstilbene as anchoring group, bridged by an energy controlling moiety, fluorocyclobutyl, has been used to obtain substrates with controlled surface energy and structure. Neutron reflectivity was used to study the surface structure of the polymer. The orientation of a well characterized liquid crystal, 8CB that exhibits both nematic and Smectic phases, was studied by optical microscopy and small angle X-ray scattering. Correlation between the surface structure of the polymeric layer and the orientation of the Smectic phase indicated direct correlation between the surface orientation and the concentration of fluorine at the interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 709: Symposium CC – Advances in Liquid Crystalline Materials and Technologies , 2001 , CC8.3.1
Copyright
Copyright © Materials Research Society 2002

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References

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