Bis-electrophilic monomers containing 1-chloro-2,2-dicyanovinyl moieties were reacted with dihydrazines, employing a vinylic nucleophilic substitution reaction, to prepare high molecular weight and processable polypyrazoles. All live polymers synthesized by this route exhibited excellent thermal stability. The polymers were fully characterized by spectroscopic methods, by solution viscosity measurements, and by thermal analysis techniques. These polypyrazoles exhibited excellent thermal stability in both nitrogen and air. Condensation of isophthalic dihydrazide with one of the bis-electrophilic monomers led to a polypyrazole in which N-1 of the pyrazole moiety was benzoylated. This polymer showed poorer thermal stability than that of the pyrazoles derived from the dihydrazines.