Optical and thermal characterization of double hydrogen bonded liquid crystals: Binary mixtures

Methyl Malonic acid (MM) forms hydrogen bonds with octyloxy benzoic acid (8OBA), nonyloxy benzoic acid (9OBA), decyloxy benzoic acid (10OBA) labeled as MM+8OBA, MM+9OBA, and MM+10OBA respectively, all three mesogens exhibit mesogenic properties. Nine binary mixtures are prepared with MM+8OBA and MM+...

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Bibliographic Details
Published inFerroelectrics Vol. 524; no. 1; pp. 102 - 137
Main Authors Chandrasekar, G., Pongali Sathya Prabu, N., Mohan, M. L. N. Madhu
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis 17.02.2018
Taylor & Francis Ltd
Subjects
Acids
Benzoic acid
Binary mixtures
Calorimetry
Chemical bonds
Cox ratio
Crystals
Hydrogen bonded liquid crystals
Hydrogen bonds
Liquid crystals
Microscopy
NMR
Nuclear magnetic resonance
Optical microscopy
Phase transitions
Phosphates
Specific heat
Stability analysis
thermal equilibrium
Thermal stability
Thermodynamic properties
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Summary:Methyl Malonic acid (MM) forms hydrogen bonds with octyloxy benzoic acid (8OBA), nonyloxy benzoic acid (9OBA), decyloxy benzoic acid (10OBA) labeled as MM+8OBA, MM+9OBA, and MM+10OBA respectively, all three mesogens exhibit mesogenic properties. Nine binary mixtures are prepared with MM+8OBA and MM+9OBA by varying their molar proportions in steps of 0.1 to 0.9. Similarly nine more binary mixtures are prepared with MM+8OBA and MM+10OBA. Two binary series namely MM+8OBA & MM+9OBA and MM+8OBA & MM+10OBA are analyzed. Various chemical and physical studies of these binary mixtures are investigated which includes Nuclear Magnetic Resonance spectral studies, FTIR, Polarizing Optical Microscopy and Differential Scanning Calorimetry. Phase diagram of above two binary series are constructed. Thermal studies derived from the DSC data include evaluation of order of phase transition, odd even effect, thermal stability factor, thermal equilibrium and variation of specific heat with temperature.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2018.1432744