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Mesogen Conformation Changes in Thermotropic Polyesters at Phase Transitions by Sergei Shilov; Boris Volchek; Vyacheslav Zuev; Sergei Skorokhodov is a Materials Science article available to read on EtoBox.

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## Abstract Mesogen conformations in thermotropic polyesters with alternating mesogens and poly(methylene) spacers were investigated by IR spectroscopy with polarized and unpolarized light. The selective deuteration of terephthaloyl‐bis(__p__‐oxybenzoate) mesogens gave a possibility of assigning part of the IR bands to terephthalic or to oxybenzoic fragments. It is shown that in the liquid crystalline melt the mesogen conformation is planar, but in the semicrystalline state it is mainly nonplanar. Differences in mesogen conformations of polymers containing an even or an odd number of methylene units in the spacer are detected. Thus, LC ordering seems to affect not only the conformation of the spacer but also the conformation of the mesogen.

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Author

Sergei Shilov; Boris Volchek; Vyacheslav Zuev; Sergei Skorokhodov

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 1022-1352)

Published

1994

Language

EN

Field

Materials Science (Physical Sciences)