Mesogenic properties of PAA/6BA binary liquid crystal complexes
Yükleniyor...
Tarih
2018-09-19
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Attribution-ShareAlike 3.0 United States
Attribution-ShareAlike 3.0 United States
Özet
A novel supramolecular liquid crystal complex has been designed and formed from pure liquid crystalspara-azoxyanisole (PAA) and 4-hexylbenzoic acid (6BA). Thermal and microstructural properties offormed PAA/6BA binary liquid crystal complex system are investigated by differential scanning calo-rimeter (DSC), polarized optical microscopy (POM) and X-ray diffractometer (XRD). Fourier transformedinfrared spectroscopy (FTIR) is used to confirm the formation of hydrogen bond between the PAA and6BA molecules. The XRD results show that the molecular ordering of the hydrogen bonded PAA/6BAcomplex is arranged in the orthorhombic structure. The DSC and POM results clearly indicate that thePAA/6BA binary complex exhibits liquid crystalline properties due to the hydrogen bonds formed be-tween the PAA and 6BA molecules. The PAA/6BA complex shows the phase transition peaks indicatingCr/N/I and I/N/SmA/Cr phase sequence during continuous heating and cooling, respectively, byDSC. These phase sequences have also been confirmed by POM observations. Furthermore, the effect ofthe heating rate on the phase transition temperature values is investigated. As the heating rate increases,the phase transition temperature values increase as well. Moreover, the activation energies for the phasetransitions of the PAA/6BA liquid crystal complex are calculated by using Kissinger, Ozawa and Takhormethods. The calculated results clearly show that the phase transitions are regular.
Açıklama
Anahtar Kelimeler
Hydrogen Bonded Liquid Crystals, Thermal Properties, Optical Properties, Microstructure
Kaynak
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
1178
Sayı
Künye
Okumuş, M., Eskalen, H., Sünkür, M., Özgan , Ş. (2018). Mesogenic properties of PAA/6BA binary liquid crystal complexes. Journal of Molecular Structure, 1178, pp. 428-435. https://doi.org/10.1016/j.molstruc.2018.10.049
