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

• Published in: Polymer bulletin (Berlin, Germany) Germany), 2013-09, Vol.70 (9), p.2493-2518
• Main Authors: Balaban, Milica, Antić, Vesna, Pergal, Marija, Godjevac, Dejan, Francolini, Iolanda, Martinelli, Andrea, Rogan, Jelena, Djonlagić, Jasna
• Format: Article
• Language: English
• Subjects: Applied sciences; Biocompatibility; Characterization and Evaluation of Materials; Chemical modifications; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Copolymers; Diamines; Diisocyanates; Diphenyl methane diisocyanate; Exact sciences and technology; Hydrogen bonding; Inorganic and organomineral polymers; Mechanical properties; Microscopy; Molecular weight; Morphology; NMR; Nuclear magnetic resonance; Organic Chemistry; Original Paper; Physical Chemistry; Physicochemistry of polymers; Polydimethylsiloxane; Polymer Sciences; Polymerization; Segments; Soft and Granular Matter; Solvents; Spectrum analysis; Superstructures; Tensile strength; Tetrahydrofuran; Thermodynamic properties; Ureas; Water resistance; X-ray scattering
• ISSN: 0170-0839; 1436-2449
• DOI: 10.1007/s00289-013-0968-2

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 13 C 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.