Dispersing multi-component and unstable powders in aqueous media using comb-type anionic polymers

E. Laarz, A. Kauppi, K.M. Andersson, Ane Mette Kjeldsen, L. Bergstrom

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We have investigated the effect of polymeric dispersants on the rheological properties and consolidation behavior of concentrated cemented carbide (WC-Co) and magnesia (MgO) suspensions. The relatively novel types of comb-type anionic polymers with grafted non-ionic side chains are effective dispersants also in multi-component powder mixtures with a complex solution and surface chemistry and result in more robust suspensions at significantly higher solids loading compared with e.g., a traditional cationic polyelectrolyte. Direct force measurements on comb-type dispersants with different lengths of the grafted ethylene oxide side chains showed that the dispersants adsorb onto a MgO surface and infer a repulsion where the range scales with the length of the poly ethylene oxide side chains. The compressibility and the consolidation behavior of MgO particle networks in response to a centrifugal force field could be related to the estimated thickness of the adsorbed comb-type dispersants.
Original languageEnglish
JournalJournal of the American Ceramic Society
Volume89
Issue number6
Pages (from-to)1847-1852
ISSN0002-7820
Publication statusPublished - 2006

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