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Influence of the chemical structure of poly(urea-urethane-siloxane)s on their morphological, surface and thermal properties

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Abstract

Segmented poly(urethane-urea-siloxane)s (PUUS) were synthesized using 4,4′-methylenediphenyl diisocyanate (MDI) and ethylene diamine (ED) as the hard segment components and hydroxypropyl-terminated poly(dimethylsiloxane) (PDMS) as the soft segment component, where the hard segment content ranged from 38 to 65 wt%. Segmented PUUSs were prepared by a two-step polymerization procedure in tetrahydrofuran/N-methylpyrrolidone (THF/NMP) mixture with a large proportion of polar solvent. The structure, composition and hard segment length were determined by 13C NMR and two-dimensional correlation spectroscopy. Thermal, mechanical, small-angle X-ray scattering and hydrogen bonding analyses indicated the formation of the microphase-separated copolymers with high tensile strength. Globular superstructures observed in the copolymer films by scanning electron microscopy (SEM) and atomic force microscopy (AFM) were probably arisen from the microstructural organization of the MDI-ED segments, depending on their content and length. The PUUS copolymers showed high water resistance and became more hydrophobic with increasing weight fraction of PDMS.

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Acknowledgments

This work was financially supported by the Ministry of Education and Science of the Republic of Serbia (Project No. 172062).

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Authors and Affiliations

  1. Faculty of Science, University of Banja Luka, Mladena Stojanovića 2, 78000, Banja Luka, Bosnia and Herzegovina

    Milica Balaban

  2. Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11000, Belgrade, Serbia

    Vesna Antić

  3. Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Studentski trg 12–16, 11000, Belgrade, Serbia

    Marija Pergal & Dejan Godjevac

  4. Department of Chemistry, University of Rome “Sapienza”, Piazzale A. Moro 5, 00185, Rome, Italy

    Iolanda Francolini & Andrea Martinelli

  5. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia

    Jelena Rogan & Jasna Djonlagić

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  1. Milica Balaban
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Correspondence to Milica Balaban.

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Balaban, M., Antić, V., Pergal, M. et al. Influence of the chemical structure of poly(urea-urethane-siloxane)s on their morphological, surface and thermal properties. Polym. Bull. 70, 2493–2518 (2013). https://doi.org/10.1007/s00289-013-0968-2

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  • DOI: https://doi.org/10.1007/s00289-013-0968-2

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