Nawawi, M. Fakhrulrazi and Salleh, Noordini M. and Lee, Vannajan Sanghiran and Cheng, Sit-Foon (2023) Synthesis, characterization and structure-mesomorphic properties relationship of palm-based azo-ester bridged liquid crystals from caprylic acid. Industrial Crops and Products, 199. ISSN 0926-6690, DOI https://doi.org/10.1016/j.indcrop.2023.116765.
Full text not available from this repository.Abstract
This paper discussed the liquid crystal properties of a new homologous series derived from palm caprylic acid that differ in terms of terminal substituents. The chemical structures of synthesized compounds were characterized by nuclear magnetic resonance (NMR), fourier transform infrared (FT-IR) and CHN elemental analysis, while the mesomorphic behaviors were evaluated by polarized optical microscopy (POM) and differential scanning calorimetry (DSC). The insertion of a polar substituent i.e. -CH3 (BME), -OCH3 (BMO), -OCH2CH3 (BEO) at the sixth position on the benzothiazole ring was able to reveal broad nematogenic temperature ranges (65.60-141.48 degrees C). The nematic mesophase stability is in order of BEO > BMO > BME, with two of them revealing their mesophase characteristics at nearly room temperature. This finding endorses a strong association between polarity factor and mesomorphism which was confirmed through density function theory with the basis set of 6-311 G d,p. The molecules also exhibit relatively high thermal stability (218-312 degrees C). This finding might be helpful in future structure design of palm-based LCs, as well as encourage the efforts in utilizing palm oil as a renewable and cheaper resource alternative, particularly in non-edible areas such as oleochemical-related research and development.
| Item Type: | Article |
|---|---|
| Funders: | Universiti Malaya (GPF054B-2018) |
| Uncontrolled Keywords: | Palm fatty acids; Caprylic acid; Azo-ester; Nematic; Mesomorphic |
| Subjects: | Q Science > Q Science (General) Q Science > QD Chemistry |
| Divisions: | Faculty of Science > Department of Chemistry |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 28 Jul 2025 04:23 |
| Last Modified: | 28 Jul 2025 04:23 |
| URI: | http://eprints.um.edu.my/id/eprint/50796 |
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