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Liquid Crystalline Silicon-Containing Dendrimers with Terminal Mesogenic Groups

  • V. Shibaev
  • N. Boiko
Part of the Advances in Silicon Science book series (ADSS, volume 2)

It is well-known that one of the main features of low-molar-mass liquid crystals and liquid-crystalline (LC) polymers is the presence of anisometric molecular fragments (mesogenic groups) responsible for LC phase (mesophase) formation. The majority of mesogenic groups consist of rigid rod-, board- (or lath-) and disk-shaped molecular moieties, which play a role of specific “building blocks”, a spontaneous ordering of which leads to the formation of different LC phases. A compound that under suitable conditions of temperature, pressure, and concentration can exist as a mesophase is usually called a mesogen or mesogenic compound.

Figure 10.1 shows various types of the best known and wide-spread mesophases. Depending on the orientational and positional organization of molecules, these mesophases may be roughly divided into nematic, smectic, and columnar LC phases. All these types of mesophases are usually formed by melting of crystalline organic solids (or cooling of an isotropic melt) and are, therefore, called thermo-tropic liquid crystals. The temperature at which the transition between the mes-ophase and the isotropic phase occurs is called the clearing (Tcl) or isotropization temperature (Tiso). Detailed information relating to low-molar-mass and polymer liquid crystals and their nomenclature may be found in a comprehensive three-volume handbook [1] and in the IUPAC Recommendations of basic terms associated with liquid crystals [2].

Keywords

Liquid Crystal Liquid Crystal Phase Mesogenic Group Azobenzene Group Carbosilane Dendrimers 
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 Science + Business Media B.V. 2009

Authors and Affiliations

  • V. Shibaev
    • 1
  • N. Boiko
    • 1
  1. 1.Chemistry DepartmentMoscow State UniversityMoscowRussia

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