Abstract
Novel polyamide-imides containing flexible segments were synthesized from aromatic dianhydrides and various furan dihydrazides by a two-steps procedure that included ring opening polyaddition to give polyhydrazide-acids, followed by thermal or chemical cyclodehydration. The polyhydrazide-acids had inherent viscosities ranging from 0.045 to 0.11
l/g. The polyamide-imides showed good solubility in aprotic polar solvents and had inherent viscosities up to 0.070
l/g, glass transition temperatures close to 250
°C and good thermal stability up to 350
°C.