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Infrared analysis of phase transitions in liquid crystal acrylate monomers bearing urethanic groups and cholesteryl as mesogen |
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| Authors: | Daniela Filip Gheorghe Singurel Cristofor I Simionescu Anisoara Socoliuc Adrian Bradu Doina Macocinschi |
| Institution: | (1) Cytophysiologie Végétale et Phycologie, UPRESA-CNRS 8013, Université de Lille 1, 659655 Villeneuve d'Ascq, France;(2) Laboratoire d'Ecologie et Phycologie, Université, Laval, Québec, G1K 7P4, Canada;(3) Ecole Normale Supérieure, CNRS – UMR 8543, Dynamique des Membranes Végétales, Complexes Protéines-Pigments, 46 rue d'Ulm, 75230 Paris Cedex 5, France;(4) Present address: Phytobiologie Cellulaire, UMR-INRA/UB1088 – FRE-CNRS 2625 – Plante-Microbe-Environnement, Université de Bourgogne à Dijon, BP 47870, 21078 Dijon Cedex, France |
| 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. |
| Keywords: | infrared analysis phase transition liquid crystal acrylate monomer |
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