Thermally resistant and mechanically stable novel hyperbranched waterborne polyurethane-urea/silica hybrid coatings were prepared by using 3-aminopropyltriethoxysilane as a coupling agent with SiO2 as a crosslinker. The extent of hydrogen bonding was investigated to show a dependence on SiO2 concentration, which increased the glass transition temperature of the polymers with increasing SiO2 concentration. Thermal decomposition profiles and the corresponding stability data suggest two-step decomposition for the hybrids; further, their stability increased with increasing concentration of SiO2. (C) 2011 Society of Chemical Industry
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