Surface and thermomechanical characterization of polyurethane networks based on poly(dimethylsiloxane) and hyperbranched polyester

• DOI: 10.3144/expresspolymlett.2013.78
• Publication Date: 2013-07-31T18:20:54Z
• Authors: M. V. Pergal; J. V. Dzunuzovic; R. Poreba; D. Micic; P. Stefanov; L. Pezo; M. Spirkova
• Keywords: Characterization

Two series of polyurethane (PU) networks based on Boltorn ® hyperbranched polyester (HBP) and hydroxyethoxy propyl terminated poly(dimethylsiloxane) (EO-PDMS) or hydroxy (HP-PDMS), were synthesized.The effect the type soft PDMS segment properties PUs was investigated by Fourier transform infrared spectroscopy (FTIR), contact angle measurements, surface free energy determination, X-ray photoelectron (XPS), scanning electron microscopy (SEM), atomic force (AFM), dynamic mechanical thermal analysis (DMTA) differential calorimetry (DSC).The characterization showed existence slightly amphiphilic character it revealed that HP-PDMS have lower energy, more hydrophobic better waterproof performances than EO-PDMS.PUs had higher crosslinking density EO-PDMS.DSC DMTA results these newlysynthesized exhibit glass transition temperatures hard segments.DMTA, SEM AFM confirmed microphase separated morphology.The obtained in this work indicate PU HBP improved thermomechanical properties.