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Two series of crosslinked poly(urethane-ester-siloxane)s were synthesized  from α,ω-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide)  (EO-PDMS-EO), 4,4’-methylenediphenyl diisocyanate and Boltorn® hyperbranched  polyesters of the second and third pseudo generation, by a two-step  polymerization in solution. The effect of the EO-PDMS-EO content and  functionality of the applied crosslinking agent on the morphology and surface  properties of the prepared poly(urethane-ester-siloxane)s was investigated by  FTIR spectroscopy, small-angle X-ray scattering (SAXS), atomic force  microscopy (AFM), scanning electron microscopy (SEM) and water absorption  measurement. Different techniques (FTIR peak deconvolution, SAXS and AFM)  revealed that decrease of the crosslinking agent functionality and EO-PDMS-EO  content promotes microphase separation in the synthesized  poly(urethane-ester-siloxane)s. SEM analysis and water absorption experiments  showed that due to the hydrophobic character of EO-PDMS-EO and its ability to  migrate to the surface of poly(urethane-ester-siloxane)s, samples synthesized  with higher EO-PDMS-EO content and crosslinking agent of lower functionality  have more hydrophobic surface and better waterproof performances. The  obtained results indicate that the synthesis of  poly(urethane-ester-siloxane)s based on EO-PDMS-EO and Boltorn® hyperbranched  polyesters leads to the creation of networks with interesting morphological  and surface properties, which can be easily tailored by changing the content  of EO-PDMS-EO segment or functionality of hyperbranched polyester

Investigation of the morphology and surface properties of crosslinked poly(urethane-ester-siloxane)s