POLY-SCHIFF BASES .3. SYNTHESIS AND CHARACTERIZATION OF POLYESTERAZOMETHINES

Ten new polyesterazomethines have been synthesized by solution polycon densation of five different diamines with 4,4'-[terephthaloyloxy]bis-3 -ethoxybenzaldehyde and 4,4'-[isophthaloyloxy]bis-3-ethoxybenzaldehyde using dimethylacetamide in the presence of anhydrous LICL. Fibrous po lymers were precipitated by pouring the solutions into water. The poly merization proceeds rapidly to give highly viscous solutions. The resu lting polymers were characterized by viscosity measurement, IR, x-ray diffraction study, elemental analysis, and DSC study. H-1-NMR spectra of some of the polymers were also recorded. The thermal stability of t he polymers was evaluated by TGA and IGA study. Electronic spectra of the polymers were recorded in H2SO4. (C) 1996 John Wiley & Sons, Inc.