Novel polyurethanes have been synthesized with the use of unsymmetric dimethylhydrazine. The average numbering molecular musses and possible structures of the polyurethanes obtained have been evaluated by complex investigations: IR-spectroscopy, viscosimetry, ebulliometry, analysis of terminal group by potentiometric non-aqueous titration, and the Kjeldahl nitrogen atoms' evaluation method. Analysis of the obtained data allows us to assume that the formation reaction of polyurethanes passes with the formation of ionic reactive centers. Only in the case of the prepolymer: unsymmetric dimethylhydrazine 1 : (6 - 1) and 2 : 1 ratios (catalytic reaction), the oligomers and film non-forming polymers of linear structure were formed. At all other ratios, polymers with low branching (comb-liked) structure were obtained.

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