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Mesomorphic and dielectric properties of heterocyclic liquid crystals with different terminal groups
Other Title(s)
الخواص الميزومورفية و العزل الكهربائي لبلورات سائلة غير متجانسة الحلقة ذات مجاميع طرفية مختلفة
Author
Source
Ibn al-Haitham Journal for Pure and Applied Science
Issue
Vol. 29, Issue 1 (30 Apr. 2016), pp.239-253, 15 p.
Publisher
University of Baghdad College of Education for Pure Science / Ibn al-Haitham
Publication Date
2016-04-30
Country of Publication
Iraq
No. of Pages
15
Main Subjects
Topics
Abstract EN
A new hetrocyclic liquid crystal compounds containing 1,3,4-oxadiazole with different substituted in para position (Bromo, Chloro, Nitro and Methyl) were synthesized and characterized by melting points, FTIR Spectroscopy and 1HNMR spectroscopy for [Cl-SR6] and [NO2-SR6] compounds.
The liquid crystalline properties of the synthesized compounds were studied by using hot-stage polarizing optical microscopy (POM), so they determined the transition enthalpies and entropies by using differential scanning calorimetery (DSC).
All of the compounds show mesomorphic properties.
The compounds [Br-SR6], [Cl-SR6] and [NO2- SR6] exhibit an enantiotropic dimorphism smectic (Sm) phase, while the compounds [Me- SR6] showed nematic (N) phase throw cooling only.
Continuously, permittivity dielectric properties, electrical conductivity, relaxation times and activation energies have been studied in the range of temperatures (70-150)°C at two frequencies (500) Hz and (1000) Hz.
Generally, the results show the dielectric permittivity and relaxation time values increasing when raising temperature, while electrical conductivity values decrease with increasing temperature.
The activation energy values were determined in terms of the Arrhenius plot.
American Psychological Association (APA)
Nasir, Juman Ahmad. 2016. Mesomorphic and dielectric properties of heterocyclic liquid crystals with different terminal groups. Ibn al-Haitham Journal for Pure and Applied Science،Vol. 29, no. 1, pp.239-253.
https://search.emarefa.net/detail/BIM-692730
Modern Language Association (MLA)
Nasir, Juman Ahmad. Mesomorphic and dielectric properties of heterocyclic liquid crystals with different terminal groups. Ibn al-Haitham Journal for Pure and Applied Science Vol. 29, no. 1 (2016), pp.239-253.
https://search.emarefa.net/detail/BIM-692730
American Medical Association (AMA)
Nasir, Juman Ahmad. Mesomorphic and dielectric properties of heterocyclic liquid crystals with different terminal groups. Ibn al-Haitham Journal for Pure and Applied Science. 2016. Vol. 29, no. 1, pp.239-253.
https://search.emarefa.net/detail/BIM-692730
Data Type
Journal Articles
Language
English
Notes
Includes appendices : p. 246-252
Record ID
BIM-692730