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Helical Sense and Twisting Power in Thermotropic Side—Chain Copolymers

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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.

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Acknowledgement

The authors wish to acknowledge helpful discussion with and technical assistance of S. D. Jacobs and K. L. Marshall of the Laboratory for Laser Energetics, University of Rochester. This work was supported by Kaiser Electronics and the Petroleum Research Fund administered by the American Chemical Society. Partial support was also provided by the U.S. Department of Energy, Division of Inertial Fusion under agreement No. DE—FC03—85DP40200 with the Laboratory for Laser Energetics, and by the Laser Fusion Feasibility Project at the Laboratory for Laser Energetics which has the following sponsors: Empire State Electric Energy Research Corporation, New York State Energy Research and Development Authority, Ontario Hydro, and the University of Rochester. Such support does not imply endorsement of the content by any of the above parties.

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Authors and Affiliations

  1. Department of Chemical Engineering and Laboratory for Laser Energetics, University of Rochester, 206 Gavett Hall, Rochester, NY, 14627, USA

    Sushil Krishnamurthy & Shaw H. Chen

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  1. Sushil Krishnamurthy
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  2. Shaw H. Chen
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Krishnamurthy, S., Chen, S.H. Helical Sense and Twisting Power in Thermotropic Side—Chain Copolymers. MRS Online Proceedings Library 214, 143–148 (1990). https://doi.org/10.1557/PROC-214-143

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