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Liquid Crystal Polymers II/III pp 1–59Cite as

Thermotropic mesophases and mesophase transitions of linear, flexible macromolecules

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Part of the book series: Advances in Polymer Science ((POLYMER,volume 60/61))

Abstract

The field of mesophases is subdivided into six different phases: liquid crystals, plastic crystals, condis crystals and the corresponding LC, PC, and CD glasses. Liquid and plastic crystals are the traditional phases with positional and orientational disorder, respectively. Condis crystals are conformationally disordered. On hand of tables of thermodynamic transition parameters of small and large molecules it is shown that the orientational order in liquid crystals is only a few per cent of the total possible, while the positional order in plastic crystals is virtually complete. Condis crystals have a wide variety of different degrees of conformational disorder. The glass transitions of all mesophases are similar in type. Macromolecules in the liquid crystalline state produce high orientation on deformation. Plastic crystals consist always of small molecules. Condis crystals may under proper conditions anneal to extended chain crystals.

On leave from the Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Łodz, Poland

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  1. Department of Chemistry, Rensselaer Polytechnic Institute Troy, 12181, New York, USA

    Bernhard Wunderlich & Janusz Grebowicz

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Wunderlich, B., Grebowicz, J. (1984). Thermotropic mesophases and mesophase transitions of linear, flexible macromolecules. In: Platé, N.A. (eds) Liquid Crystal Polymers II/III. Advances in Polymer Science, vol 60/61. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-12994-4_1

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