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Molecular theory of liquid crystals

  • Paul J. Flory
Conference paper
Part of the Advances in Polymer Science book series (POLYMER, volume 59)

Abstract

The lattice theory of liquids consisting of rodlike molecules is presented and discussed with emphasis on polymers exhibiting nematic or cholesteric liquid crystallinity. Steric repulsions between the solute particles are principally responsible for order in lyotropic liquid-crystalline systems. In the case of rigid rods, the axial ratio of the particles governs the concentration at which separation of a nematic or cholesteric phase sets in. For semi-rigid chains such as those of cellulose and its derivatives, the axial ratio of the Kuhn segment is the relevant parameter. These and other predictions of the lattice theory are confirmed by numerous experiments. Liquid crystallinity may be promoted by orientation-dependent intermolecular attractions between extended chain molecules. Such forces originate in the anisotropy of the polarizabilities of groups, e.g., phenylene, in the main chain. They may be especially important in thermotropic melts and concentrated solutions.

Keywords

Liquid Crystal Ethyl Cellulose Axial Ratio Nematic Phase Isotropic Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Paul J. Flory
    • 1
  1. 1.Department of ChemistryStanford UniversityStanfordUSA

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