Polyurethane Incorporating Oxidatively Degradable Diacylhydrazine Moiety: Synthesis, Characterization, and Thermal Analysis

Oxidatively degradable and thermally stable polyurethanes incorporating diacylhydrazine moieties were synthesized via solution polymerization of 4-hydroxy-N'-(4-hydroxybenzoyl)benzohydrazide with hexamethylene diisocyanate and toluene-2,4-diisosyanate. Structural characterization by NMR and IR confirmed the successful incorporation of diacylhydrazine and carbamate groups. TGA-DTA analysis revealed multistep thermal degradation with high stability. The polymers exhibited rapid oxidative degradation in 10% sodium hypochlorite, yielding carboxylic acids. Strong intermolecular hydrogen bonding rendered them insoluble in most organic solvents but soluble in highly polar media such as NMP and concentrated H2SO4. This study presents a versatile strategy for designing polyurethanes with both thermal robustness and controlled oxidative degradability. Dhaka Univ. J. Sci. 74(1): 186-191, 2026 (January)