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Effects of Organotitanate Additions on the Dispersion of Aluminum Nitride in Nonpolar Solvents
Author(s) -
Liao Hongmei,
Coyle Thomas W.
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08484.x
Subject(s) - materials science , rheology , viscosity , titanate , ceramic , dispersion (optics) , chemical engineering , molding (decorative) , particle size , adsorption , sedimentation , composite material , mineralogy , sediment , chemistry , organic chemistry , paleontology , physics , optics , biology , engineering
Organotitanate additives are known to reduce the viscosity of many filled polymer systems, including formulations of interest for ceramic powder injection molding. Mineral oil was used as a model solvent for these systems to examine the effects of Organotitanate additions on the stability and rheology of A1N dispersions. Addition of the titanate coupling agents neoalkoxy tri(neodecanoyl) titanate and neoalkoxy tri(dioctylphosphato) titanate resulted in better dispersion as measured by sedimentation tests and rheological characterizations. Excellent correlation of the sediment heights and measured viscosities with adsorption isotherms for the organotitanates was shown, with both lower sediment height and lower viscosity obtained when a monolayer of the titanate molecules was present on the powder surface. Comparison of the behavior of the mineral oil based systems with the viscosity of corresponding polypropylene based binder systems indicates that the titanate additions are effective in reducing particle‐particle interaction effects in both systems.