Abstract
Bentonite and microcrystalline cellulose are used as thickening agents and binders; their interaction was studied in suspension and in the solid state. Mixtures of the two solids covering the whole range of compositions were prepared by blending their aqueous suspensions under high shear. The rheological behavior of the mixed suspensions and the mechanical properties of composite films prepared by drying thin layers of these suspensions were investigated as a function of composition. Based on the volume-percentage of the dry components, bentonite was about five times more effective in increasing the viscosity of aqueous suspensions than cellulose. Cellulose tended to produce yield values. Bentonite formed strong films when its aqueous suspensions were dried; neither pure cellulose nor a mixture containing 88 vol. % cellulose formed coherent films. In the range of 0-77 vol. % cellulose, the in-plane and perpendicular tensile strengths of the composite films decreased only moderately with increasing cellulose content.
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