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ABSTRACT
The resistance of ordered mixtures to component segregation during processing is dependent upon the adhesion forces between the fine adherent particles and the carrier component within ordered units. A method is described that allows the adhesion force acting on individual adherent particles to be determined, using ultracentrifugation to apply a wide range of separating forces. Individual ordered units are located at the end of fine holes drilled through a thin brass plate and fixed in position with transparent adhesive tape.The plate is mounted in a specially constructed holder during ultracentrifugation, the axis of the holes being parallel to the centripetal acceleration, photomierographs, using a modified microscope with an enhanced depth of field of view, of the distribution of adherent fines were made after each period of ultracentrifugation. Comparison of photomicrographs enabled the determination of the numbers of fine adherent particles dislodged after each period of ultracentrifugation. Determination of the numbers of dislodged adherent fines was difficult due to problems with changes in the orientation of ordered units during ultracentrifugation and the resolution and focus of the modified microscope. Examination of scanning electron micrographs showed that changes in orientation of ordered units were due to flattening of the contact areas between the brass plate and ordered units.