Effect of a Catalyst on the Synthesis and Properties of Polysiloxane–(Propylene Oxide)–Urethane–Ureas Based on H12-MDI

Network polysiloxane–(profpylene oxide)–urethane–ureas based on α,ω-bis[(3-aminopropyl)diethoxy]oligodimethyl-siloxanes, H12-MDI and oligo(propylene oxide) were synthesized in the presence of three different catalysts: bismuth(III) neodecanoate, dibutyltin dilaurate, and diethyltin dicaprylate. The mechanical properties of the resulting polymers were studied. TMA investigations of the samples revealed the presence of two glass-transition temperatures which correspond to the glass-transition temperatures of the organic and siloxane phases.