Microphase separation and hydrophobicity of urethane/siloxane copolymers with low siloxane content |
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Authors: | A. Santiago,L. Martin,J.J. Iruin,M.J. Ferná ndez-Berridi,A. Gonzá lez,L. Irusta |
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Affiliation: | 1. POLYMAT, Department of Polymer Science and Technology, University of the Basque Country UPV-EHU, PO Box 1072, 20080 Donostia/San Sebastián, Spain;2. Group “Materials+Technologies”, Department of Chemical and Environmental Engineering, Polytechnic School, University of the Basque Country UPV-EHU, Plaza Europa 1, 20018 Donostia/San Sebastián, Spain |
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Abstract: | Polyurethane–siloxane thermoset copolymers were obtained from Isophorone diisocyanate trimer, Polycaprolactone triol and 10% of hydroxy terminated Polydimethyl siloxane. The copolymers showed a phase separated structure that depended on the conversion of the reaction and casting temperature. The different samples obtained had water contact angles higher than 90°. Moreover the contact angle values presented a maximum at intermediate reaction conversion. Although FTIR measurements showed that siloxane concentration at the surface increased with reaction time, the maximum contact angle value was related to the higher roughness calculated from AFM images. DMTA results confirmed that the phase separation was higher at intermediate conversions. |
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Keywords: | Polyurethane&ndash siloxane thermoset copolymers Phase separation Contact angle Hydrophobicity |
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