Preparation and Characterization of Functionalized Nano-Al2O3/PU Sol
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Abstract:
The functionalized nano-Al2O3/PU sol was prepared in a sol-gel process, using aluminium isopropoxide (AIP) as raw material and polyurethane (PU) as a coupling agent. The effects of hydrolysis temperature, n(H2O)/n(Al3+), n(H+)/n(Al3+), peptization agent, aging temperature and time on the particle size and viscosity of the sol were studied. The optimal conditions for preparing stable and transparent functionalized nano-Al2O3 sol were obtained as hydrolysis temperature 80 ℃, n(H2O)/n(Al3+) 105, n(H+)/n(Al3+) 0.24, HNO3 as peptization agent, aging temperature 80 ℃ and aging time 24 h. The properties and structure of the sol were characterized by Nano particle analyzer and FI-IR. The results indicated that the particle size and viscosity of Al2O3/PU sol ranged from 40 to 120 nm and 4 to 10 mPa?s, respectively. C=C double bond and the hydrophilic groups, such as hydroxyl group and carboxyl group were successfully introduced to the functionalized nano-Al2O3/PU sol, which can enhance the chemical bond between AIP and PU and increase the strength of the sol.
