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Phase Behavior of Polyelectrolyte Complexes and Rheological Behavior of Alumina suspensions for Direct Ink Writing

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Polyelectrolyte complexes have a bright prospect for fabricating 3D periodic structures by direct ink writing. The phase behavior of complexes containing poly(acrylic acid) and poly(ethylenimine) and rheological behavior of Al2O3 colloidal suspensions are characterized. The results reveal that the pH value of solution takes an important role on the phase behavior of polyelectrolyte complexes. When the [COOH]:[NH x ] ratio is higher than or lower than the critical value of 0.6, the pH range of turbid complex solutions narrows down and meanwhile moves to acidic or alkaline region, respectively. The addition of pH regulators prompts polyelectrolyte exchange reaction and soluble complexes are suitable for preparation of cera‐mic suspensions. The polyelectrolyte suspensions with linear viscoelasticity at lower shear stress and good fluidity at higher shear stress are identified for direct ink writing of 3D structures with microsized feature.
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Document Type: Research Article

Publication date: June 1, 2016

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