Аннотация:Network polysiloxane(propylene oxide)urethaneureas based on α, ω-bis-[(3-aminopropyl) diethoxy] oligodimethylsiloxane, H12-MDI and oligopropylene oxide were synthesized in the presence of three different catalysts: bismuth (III) neodecanoate, dibutyl tin dilaurate and diethyl tin dicaprylate. Mechanical properties of the synthesized polymers were tested. TMA study of the samples revealed the presence of two glass transition temperatures corresponding to the glass transition temperatures of the organic and siloxane phases.