Novel hyperbranched waterborne polyurethane-urea/silica hybrid coatings and their characterizations

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.Copyright © 2011 Society of Chemical Industry Thermally resistant and mechanically stable novel hyperbranched waterborne polyurethane‐urea, (HWBPU)/silica hybrid coatings were prepared by using 3‐aminopropyltriethoxysilane (APTES) as a coupling agent with SiO2 as a crosslinker.