Synthesis of imine-ester-linked benzothiazole mesogen containing liquid crystalline monomers with different terminal substituents
Source abstract
Abstract
A series of imine-ester-linked benzothiazole mesogen-based liquid crystalline (LC) monomers (M1–M4) having polymerizable methacrylate functional group as the terminal were designed and synthesized. These monomers were differentiated from each other by varying the terminal substituents (-H, -CH3, -OCH3, and -OCH2CH3) at the sixth position on the benzothiazole moiety. The chemical structures of the synthesized monomers were characterized and confirmed by spectroscopic techniques such as FTIR, 1H NMR, and 13C NMR. Thermogravimetric analysis (TGA) was used to study the thermal properties of the investigated monomers. The ethoxy substituted monomer (M4) showed higher thermal stability compared with the other monomers. The mesomorphic behavior of all the monomers was studied using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). DSC and POM studies revealed that the monomer (M1) having no substituent at the sixth position on the benzothiazole ring exhibited both smectic and nematic mesophases, whereas -CH3-, -OCH3-, and -OCH2CH3-substituted compounds revealed only nematic mesophase.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Liquid Crystal Research Advancements · Photochromic and Fluorescence Chemistry · Surfactants and Colloidal Systems
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
Department of Chemistry, Rajshahi University, Rajshahi, Bangladesh
Funding
Institut Pengurusan dan Pemantauan Penyelidikan, Universiti Malaya
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