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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2013, 3, 5—13.
Mesogenic 4-Alkoxy- and 4-( n-Hydroxyalkyloxy)-4'- (2,2-Dicianoethenyl)Azobenzenes. II. Mesomorphic Properties, Dipole Moments and Thermal Analysis
K. M. Litov1, I. V. Novikov1, S. A. Kuvshinova1, O. V. Potemkina2, V. A. Burmistrov1, O. I. Koifman1
Author affiliations 1Ivanovo State University of Chemistry and Technology, Institute of Macroheterocycles
153000 Ivanovo, Sheremetevsky pr., 7 2Ivanovo Institute of the State Fire Service
Stroitelei pr. 33, Ivanovo, 153040 Russia. E-mail: SEVERUS_87@mail.ru
Abstract Mesomorphic properties of synthesized azobenzenes containing 2,2-dicyanoethenyl fragment were studied by polarization thermomicroscopy and differential scanning calorimetry methods. The type of mesomorphism, temperatures of phase transitions and temperature intervals of mesophase existence were determined. The phase diagram of a binary mixture of 4-(6-hydroxyhexyloxy)-4'-(2,2-dicyanoethenyl)azobenzene – 4-heptyloxy-4'-cyanobiphenyl was drawn. Dipole moments for three synthesized substances were determined. Thermal analysis of two homologues was made and onset temperatures of decomposition were determined. The influence of 2,2-dicyanoethenyl substituent on properties of azobenzenes is discussed
Keywords: mesomorphic properties, temperature of phase transition, differential scanning calorimetry, dipole moment, thermal stability