Abstract
Thermosensitive ZnO suspensions containing poly(acrylic acid)-graft-poly(N-isopropylacrylamide) (PAA-g-PNIPAM) are used to prepare complex-shaped ceramic parts by controlling the phase transition of PNIPAM graft chains. The properties of PAA-g-PNIPAM aqueous solution and the rheological behavior of ZnO suspensions with PAA-g-PNIPAM were investigated. The results show that PAA-g-PNIPAM is a pH- and temperature-sensitive polymer, and its lower critical solution temperature is 32 °C. The isoelectric point of ZnO particles shifts from 9.1 to 4.8 after adding PAA-g-PNIPAM, and the adsorption capacity of PAA-g-PNIPAM on ZnO particles decreases with increasing pH value. The 45 vol.% ZnO suspension containing 3.0 mg/g PAA-g-PNIPAM exhibits a good fluidity at room temperature, and a rapid increase in apparent viscosity and shear elastic modulus above 32 °C due to the decay of steric hindrance and the increase of effective volume fraction caused by the phase transition of PNIPAM graft chains. The complex-shaped ceramic parts prepared using thermosensitive ZnO suspensions are in good condition with few pores.
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