Thermally Induced Reversible Coagulation in Ceramic Powder-Polymer Liquid Suspensions

It was observed that slurries of oxide powders in oxidized polybutene fluids can be caused to change reversibly between fluid, nearly Newtonian behavior and plastic behavior by modest changes in temperature. This phenomenon was believed to result from changes in the dispersion vs association among t...

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Vydáno v:Journal of the American Ceramic Society Ročník 80; číslo 7; s. 1789 - 1797
Hlavní autoři: Horn, Jeffrey A., Patterson, Burton R.
Médium: Journal Article Konferenční příspěvek
Jazyk:angličtina
Vydáno: Oxford, UK Blackwell Publishing Ltd 01.07.1997
Blackwell
Wiley Subscription Services, Inc
Témata:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
General studies
Technical ceramics
Zirconia
Interaction
Coagulation
Butylene polymer
Particle suspension
Experimental study
Alumina
Oxide ceramics
Powder
Rheological properties
Titanium Oxides
ISSN:0002-7820, 1551-2916
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Shrnutí:It was observed that slurries of oxide powders in oxidized polybutene fluids can be caused to change reversibly between fluid, nearly Newtonian behavior and plastic behavior by modest changes in temperature. This phenomenon was believed to result from changes in the dispersion vs association among the particles. The rheological effects of temperature, polymer oxidation, and particle size were observed for 30 vol% slurries of TiO2, Al2O3, and ZrO2 powders in polybutene fluids. Elasticity (in oscillation) and low‐shear‐rate viscosity (in steady shear) were observed to increase with increasing temperature for TiO2 and Al2O3 particles in oxidized polybutene fluids. This behavior was attributed to the creation of interparticle structures. The attainment of this structure on heating was observed to be inhibited by increased oxidation of the polymer and increased particle size. It was concluded that the adsorption of oxidized molecules from the polymer liquid, along with the high viscosity of the bulk polymer, resulted in suspensions that were metastable against coagulation. Increased temperature resulted in lower viscosities of the liquid, allowing coagulation on a short time scale. The presence of the adsorbed polymer, however, prevented intimate contact among the particles so that the coagulated structure was easily destroyed upon subsequent cooling and shearing.
Bibliografie:istex:ABB847AADF1F54BB5A7A4F8F497F46F0BEDFBD63
ark:/67375/WNG-MFHCBZCW-7
ArticleID:JACE1789
Member, American Ceramic Society.
The Pennsylvania State University, 147 Research Building West, University Park, Pennsylvania 16802‐6809.
ObjectType-Article-1
SourceType-Scholarly Journals-1
content type line 14
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1997.tb03053.x