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Two series of polyurethane films based on hyperbranched polyester of the   second pseudogeneration (Boltorn®), 4,4'-methylenediphenyl diisocyanate and   two different siloxane prepolymers, α,ω-dihydroxy-(ethylene   oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and   α,ω-dihydroxypropyl-poly(dimethylsiloxane) (HP-PDMS), were prepared by   two-step polymerization in solution. The influence of the type and content of   soft segment on the morphology, thermomechanical and surface properties of   the synthesized polyurethanes was studied by atomic force microscopy (AFM),   small-angle X-ray scattering (SAXS), scanning electron microscopy (SEM),   dynamic mechanical thermal analysis (DMTA) and water absorption measurements.   It was found that these techniques confirmed existence of microphase   separated morphology. Synthesized polyurethanes exhibited two glass   transition temperatures and one second relaxation process. The results showed   that polyurethanes based on HP-PDMS had higher surface roughness, better   microphase separation and waterproof performances. Samples synthesized with   lower PDMS content had less hydrophobic surface, but higher crosslinking   density and better thermomechanical properties. (Projekat Ministarstva nauke   Republike Srbije, br. 172062

Study on the morphology and thermomechanical properties of poly(urethane-siloxane) networks based on hyperbranched polyester