SYNTHESIS AND CHARACTERIZATION OF NOVEL THERMALLY STABLE POLYPYRAZOLES

Bis-electrophilic monomers containing 1-chloro-2,2-dicyanovinyl moieti es were reacted with dihydrazines, employing a vinylic nucleophilic su bstitution reaction, to prepare high molecular weight and processable polypyrazoles. All live polymers synthesized by this route exhibited e xcellent thermal stability. The polymers were fully characterized by s pectroscopic methods, by solution viscosity measurements, and by therm al analysis techniques. These polypyrazoles exhibited excellent therma l stability in both nitrogen and air. Condensation of isophthalic dihy drazide with one of the bis-electrophilic monomers led to a polypyrazo le in which N-1 of the pyrazole moiety was benzoylated. This polymer s howed poorer thermal stability than that of the pyrazoles derived from the dihydrazines.