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Research on Chemical Intermediates

, Volume 28, Issue 1, pp 1–11 | Cite as

Infrared analysis of phase transitions in liquid crystal acrylate monomers bearing urethanic groups and cholesteryl as mesogen

  • Daniela Filip
  • Gheorghe Singurel
  • Cristofor I. Simionescu
  • Anisoara Socoliuc
  • Adrian Bradu
  • Doina Macocinschi
Article

Abstract

An infrared analysis of phase transitions in three enantiotropic liquid crystalline acrylate monomers with different spacer lengths bearing urethane groups and cholesteryl as mesogen was carried out. Through heating and cooling, spectral modifications especially at the level of carbonyl, –NH– and urethane alkoxyl oxygen groups were found. These findings reveal the influence of hydrogen bonding on mesomorphic properties of the studied compounds mentioning that both liquid crystal transitions are evidenced by the spectral changes. For all the compounds studied, the values of the transition temperatures deduced from the spectral modifications are in good agreement with those obtained from DSC measurements.

infrared analysis phase transition liquid crystal acrylate monomer 

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Copyright information

© VSP 2002 2002

Authors and Affiliations

  • Daniela Filip
  • Gheorghe Singurel
  • Cristofor I. Simionescu
  • Anisoara Socoliuc
  • Adrian Bradu
  • Doina Macocinschi

There are no affiliations available

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