| Abstract: | Polyaminotetrazoles were obtained by the action of hydrazoic acid on solutions of polycarbodimides prepared from methylenebis(4-phenyl isocyanate), toluene 2,4-diisocyanate, 3,3′-dimethoxy-4,4′-biphenylene diisocyanate, mesitylene diisocyanate, and hexamethylene diisocyanate. The polyaminotetrazoles, which were soluble only in concentrated sulfuric acid, had inherent viscosities of 0.12–0.78. Polymerization of the disodium salts of bistetrazoles with α,ω-dihalides gave polytetrazoles without the secondary amine linkage in the chain. The bistetrazoles, used were methylenebis(5-tetrazole) and 5,5′-p-phenylenebistetrazole, and the dihalides were α,α′-dichloro-p-xylene, 1,2-dibromoethane, and 1,4-dibromobutane. The polytetrazoles were soluble in concentrated sulfuric acid and had low inherent viscosities, 0.08–0.17. Thermogravimetric analyses showed that marked degradation of both classes of polymers occured at 250–300°C. |
