Synthesis and properties of poly(arylene ether pyrazole)s

Poly(arylene ether pyrazole)s containing N-H and N-phenyl groups have been prepared by the aromatic nucleophilic displacement reaction of two new bisphenols containing a pyrazole ring with activated aromatic dihalides in N,N-dimethylacetamide at 155 degrees C in the presence of anhydrous potassium carbonate. The polymers exhibited glass transition temperatures (T-g) ranging from 190-296 degrees C and inherent viscosities from 0.44-1.96 dl g(-1) Poly(arylene ether-pyrazole)s containing N-H groups exhibited higher Tg and mechanical properties than the corresponding N-phenyl-containing poly(arylene ether pyrazole)s. The chemistry, physical and mechanical properties of these polymers are discussed.