Journal
MOLECULES
Volume 17, Issue 1, Pages 645-656Publisher
MDPI
DOI: 10.3390/molecules17010645
Keywords
synthesis; diglycidyl ether; schiff base; liquid crystal
Funding
- Universiti Sains Malaysia
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The phenolic Schiff bases I-VI were synthesized by condensation reactions between various diamines, namely o-dianisidine, o-tolidine and ethylenediamine with vanillin or p-hydroxybenzaldehyde and subsequent reactions between these phenolic Schiff bases and epichlorohydrin to produce new diglycidyl ethers Ia-VIa. The structures of these compounds were confirmed by CHN, FT-IR, H-1-NMR, and C-13-NMR spectroscopy. Their thermotropic liquid crystalline behavior was studied using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). All the diglycidyl ethers prepared exhibit nematic mesophases, except for Va and VIa, which did not show any transition mesophases, but simply flow to liquids.
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