Poly ( acylsemicarbazide ) s incorporating furanic moieties synthesis , characterization and properties of a homologous series

Solution polycondensation of furanic dihydrazides with different bridging groups, in conjunction with various aromatic diisocyanates, gave high yields of a novel series of furanic poly(acylsemicarbazide)s with high molecular weights. The polymers were characterized by solubility tests, viscosity measurements, 1 H NMR, 13 C NMR and FTIR spectroscopies and thermogravimetric analysis. The poly(acylsemicarbazide)s obtained had inherent viscosities in the range of 0.23-0.70 dL/g, and were easily dissolved in common organic solvents. The glass-transition temperatures of these polymers were recorded between 135 and 200°C. Decomposition temperature for 10% weight loss all occurred above 350°C in nitrogen atmosphere. Preliminary tests on films of all polymers indicated that these materials were flexible and tough.