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Thermotropic Chiral Nematic Polymers as Optical Materials

Published online by Cambridge University Press:  21 February 2011

S.H. Chen*
Affiliation:
Department of Chemical Engineering and Laboratory for Laser Energetics 206 Gavett Hall, University of Rochester, Rochester, NY 14627
M.L. Tsai
Affiliation:
Department of Chemical Engineering and Laboratory for Laser Energetics 206 Gavett Hall, University of Rochester, Rochester, NY 14627
S.D. Jacobs
Affiliation:
Department of Chemical Engineering and Laboratory for Laser Energetics 206 Gavett Hall, University of Rochester, Rochester, NY 14627
*
*To whom correspondence should be addressed.
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Abstract

Chiral nematic copolymers based on optically active cholesterol, dihydrocholesterol, (R)-(+)- and (S)-(−)-1-phenylethylamine, and (+)- and (−)- isopinocampheol were synthesized and characterized for the investigations of thermotropic and optical properties. Although helical sense does not appear to correlate with the sign of [α]D of the precursor chiral compound as suggested by the observations of cholesteryl and dihydrocholesteryl copolymers, the inversion of chirality in the pendant group, (R)-(+)- vs (S)-(−)-1-phenylethylamine, does lead to the opposite handedness in the resultant helical structure. To better understand the structure-property relationships involving helical sense and twisting power, systematic studies of the roles played by both nematogenic and chiral structures as well as other structural features of the comonomers should be conducted.

Type
Research Article
Copyright
Copyright © Materials Research Society 1990

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References

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