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Helical Sense and Twisting Power in Thermotropic Side–Chain Copolymers

Published online by Cambridge University Press:  22 February 2011

Sushil Krishnamurthy  and
Shaw H. Chen
Sushil Krishnamurthy
Affiliation:
Department of Chemical Engineering and Laboratory for Laser Energetics, 206 Gavett Hall, University of Rochester, Rochester, NY 14627
Shaw H. Chen
Affiliation:
To whom correspondence should be addressed.
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Abstract

Thermotropic chiral nematic copolymers containing (S)–(–)–1–phenylethyl alcohol and (R)–(–)–methyl mandelate with methacrylate backbone and those containing (S)–(–)–1–phenylethylamine and cholesterol with acrylate/methacrylate mixed backbone structures have been synthesized and characterized. It is found that the helical sense is dictated by chiral/nematic molecular interactions of a steric nature, and that the helical twisting power (HTP) is favored by the structural similarity between the chiral and nematic components. Furthermore, it is shown that HTP can be optimized with a suitable nematogenic comonomer by regulating the backbone flexibility within the acrylate/methacrylate series, which facilitates supramolecular arrangement without affecting the HTP.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 214: Symposium R1 – Optical and Electrical Properties of Polymers , 1990 , 143
Copyright
Copyright © Materials Research Society 1991

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