Journal of Applied Polymer Science, Vol.100, No.2, 1198-1204, 2006
Improvement of thermal stability of new heteroaromatic poly(azomethine urethane)s
New poly(azomethine urethane)s were synthesized in the conventional literature manner by reacting a new bisphenol-containing azomethine group, N,N'-bis(4-hydroxyl-3-methoxy benzylidine)-2,6-diaminopyridine (1) with various diisocyanates, such as hexamethylene diisocyanate (HDI) (a), methylene-4,4'-diphenyl diisocyanate (MDI) (b), and toluene-2,4-diisocyanate (TDI) (c). The resulting polymers 1(a-c) were confirmed by H-1-NMR, FTIR, UV, and CHN analyses. Thermogravimetric analysis (TGA) revealed that the polymers have high thermal stability. A semicrystalline behavior was noticed for polymers by wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). (c) 2006 Wiley Periodicals, Inc.
Keywords:thermal properties;polyurethanes;heteroatom-containing polymers;2,6-diaminopyridine;synthesis