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BERA, O. TRUNEC, M.
Original Title
Optimization of Fine Alumina Gelcasting Using In Situ Dynamic Rheology
Type
journal article in Web of Science
Language
English
Original Abstract
In situ dynamic rheology was used to investigate the polymerization process of gelcasting suspensions based on fine alumina and water solution of methacrylamide and methylene bisacrylamide monomers. Small-strain oscillatory shear measurements were able to detect the progress of the whole gelation process from the liquid suspension to the elastic gel. The parameters describing the gelation kinetics and final gel properties such as idle time, total gelation time and equilibrium complex viscosity were correlated with the initiator/accelerator concentration, linear to cross-linking monomer ratio, polymerization temperature, and alumina loading. A strong catalytic effect of fine alumina particles on the decomposition of ammonium persulfate into free radicals was established. The catalytic activity of alumina powder was controlled by ions adsorbed on the particle surface. The catalytic effect of alumina in the presence of the Dolapix CE 64 dispersant made the polymerization process independent of the accelerator concentration and enabled the gelation of concentrated ceramic suspensions at and below room temperature without any accelerator. The variations of the polymerization process in the range of investigated gel compositions did not affect the particle packing in green bodies and the densities of sintered ceramic bodies were similar.
Keywords
Suspensions; Gels; Rheology; Polymerization; Catalyst
Authors
BERA, O.; TRUNEC, M.
RIV year
2012
Released
1. 9. 2012
Publisher
Wiley-Blackwell
Location
COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
ISBN
0002-7820
Periodical
Journal of the American Ceramic Society
Year of study
95
Number
9
State
United States of America
Pages from
2849
Pages to
2856
Pages count
8
BibTex
@article{BUT94080, author="Oskar {Bera} and Martin {Trunec}", title="Optimization of Fine Alumina Gelcasting Using In Situ Dynamic Rheology", journal="Journal of the American Ceramic Society", year="2012", volume="95", number="9", pages="2849--2856", doi="10.1111/j.1551-2916.2012.05293.x", issn="0002-7820" }