The Role of Polymer Compatibility in Ceramic Processing
Date
2002-09
Authors
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Journal ISSN
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Publisher
New York State College of Ceramics at Alfred University. Kazuo Inamori School of Engineering.
Abstract
The proper use of multiple polymeric additives in ceramic processing is
discussed. First, the use of a polyelectrolyte as a dispersant is studied by looking at the
adsorption of various molecular weight PAAs on clay and the effect on suspension
rheology. The adsorption of PAA on clay particles is not influenced by molecular
weight, but there exists an optimal chain length for minimum viscosity. Secondly, the
interactions between polymeric additives in suspensions and during drying are
investigated. The phase behavior of polymer systems is studied by Flory-Huggins theory
and the interactions in polymer solutions are examined using light scattering and optical
microscopy. The results are used to explain the PVA migration behavior. PVA can be
stained and its location within the spray dried granule can be observed, verifying the
effect of other polymers on binder migration. It is shown that phase separation of
polymer systems is the primary reason for the PVA migration. The chain length and
functional groups of polymers determine the phase behavior of polymers and in turn the
degree of binder migration.
Description
Advisory committee members: David Earl, Michele Hluchy, Rebecca Derosa. Dissertation completed in partial fulfillment of the requirements for the degree of Doctorate of Philosophy in Ceramics at the Kazuo Inamori School of Engineering, New York State College of Ceramics at Alfred University
Type
Thesis