title: Synthesis of new liquid crystalline diglycidyl ethers.
abstract: 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, (1)H-NMR, and (13)C-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.
authors.affiliation: School of Industrial Technology, University Sains Malaysia, Penang 11800, Malaysia. issam@usm.my
authors.forename: Issam Ahmed
authors.initials: IA
authors.lastname: Mohammed
authors.forename: Rashidah Mohamed
authors.initials: RM
authors.lastname: Hamidi
mesh_terms: D002152:Calorimetry, Differential Scanning; D004075:Diglycerides / Q000138:chemical synthesis* / Q000737:chemistry; D004987:Ethers / Q000138:chemical synthesis* / Q000737:chemistry; D050866:Liquid Crystals / Q000737:chemistry*; D008859:Microscopy, Polarization; D015394:Molecular Structure; D010636:Phenols / Q000138:chemical synthesis* / Q000737:chemistry; D012545:Schiff Bases / Q000138:chemical synthesis* / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D004075:Diglycerides; D004987:Ethers; D010636:Phenols; D012545:Schiff Bases