Artículos de revistas
Studies of first- and second-order phase transitions in LC methacrylic monomers based on the omega-hexyloxysalicylaldimine group
Fecha
2007Registro en:
LIQUID CRYSTALS 34(7): 883-889
0267-8292
Autor
Soto Bustamante, Eduardo
González Henríquez, Carmen M.
Vergara Toloza, Rafael Orlando
Rodríguez Lehyt, Guillermo Antonio
Institución
Resumen
The synthesis and phase characterization of two liquid crystalline methacrylic monomers based on the omega-hexyloxysalicylaldimine group with octyl and decyloxy chain substitutions is presented. The liquid crystalline materials were characterized by polarizing optical microscopy, differential thermal analysis and X-ray diffractometry. Nematic and tilted smectic C phases were observed in the compounds. Their liquid crystalline properties where compared with previously studied samples of homologous compounds. In contrast to previous results, this structural modification induces pronounced enantiotropic first-order phase transitions between nematic and smectic C mesophases. A correlation between the phase transition behaviour and structural features of the sample is included.