Title :
Polymorphism of righthanded octyloxycyanobiphenyl
Author :
Sciesinski, J. ; Sciesinska, E. ; Massalska, E. ; Massalska-Arodz, M. ; Wasiutynski, T. ; Zielinski, P.M. ; Witko, W.
Author_Institution :
Henry Niewodniczanski Inst. of Nucl. Phys., Krakow
fDate :
6/1/2001 12:00:00 AM
Abstract :
Polymorphism of the octyloxycyanobiphenyl isomer 4-(1(S)-methylheptyloxy)-4´cyanobiphenyl (8OCB) was studied by means of adiabatic calorimetry, infrared spectroscopy and polarizing microscopy. Two crystalline phases, C1 and C2, were identified and their thermodynamic parameters measured. A monotropic system of the metastable C1 and stable C2 crystals was obtained. Far infrared absorption and polarizing microscopy textures are discussed
Keywords :
crystallisation; glass transition; heat of transformation; infrared spectra; optical microscopy; organic compounds; polymorphism; solid-liquid transformations; specific heat; texture; 4-(1(S)-methylheptyloxy)-4´cyanobiphenyl; adiabatic calorimetry; crystalline phases; far infrared absorption; infrared spectroscopy; metastable C1 crystal; monotropic system; octyloxycyanobiphenyl isomer; polarizing microscopy; polarizing microscopy textures; polymorphism; righthanded octyloxycyanobiphenyl; stable C2 crystal; thermodynamic parameters; Calorimetry; Cooling; Crystallization; Electrical resistance measurement; Glass; Heating; Infrared spectra; Microscopy; Phase measurement; Polarization;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
