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| - Persulfate−Amine Initiation Systems for Gelcasting ofCeramic Foams
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| Abstract
| - The in situ polymerization of organic monomers to consolidate ceramic suspensions inthe form of gelled bodies with very complex shapes has recently been employed for themanufacture of both dense and porous ceramics. The control of the polymerization rate isvery important, particularly for the porous ceramics where there is the need for fastconsolidation to retain the foamed suspension without damage to the pore structure or lossof pore volume. In the current work, ammonium acrylate and methylenebisacrylamide wereused to promote gelation of foamed alumina suspensions. A variety of amine catalysts weretested in combination with ammonium persulfate as initiating systems for polymerization.Analysis of the exothermic profiles registered during polymerization revealed that thepolymerization onset and rates are markedly influenced by the concentration and type ofinitiating species, with tertiary diamines being the most efficient accelerators.
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