Microstructure and properties of poly(urethane-siloxane)s based on hyperbranched polyester of the fourth pseudo generation

► Preparation of polyurethane networks based on PDMS and two hyperbranched polyesters. ► The structure-property relationships were characterized and discussed. ► DMTA revealed existence of two TgS: hard and soft segments. ► PU networks based on BH-40 have higher crosslinking density and better thermal properties. ► Lower PDMS content induced better microphase separation and better mechanical properties.