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Application of poly(vinyl alcohol) with an alkyl end group containing anionic groups to coal–water slurry as a dispersant
Author(s) -
Yamauchi Junnosuke,
Terada Kazutoshi,
Sato Toshiaki,
Okaya Takuji
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070551106
Subject(s) - dispersant , vinyl alcohol , sulfonate , coal water , chemistry , coal , polyacrylic acid , vinyl acetate , alkyl , chemical engineering , polymer chemistry , sodium , organic chemistry , polymer , copolymer , dispersion (optics) , physics , optics , engineering
Anionic groups were introduced with copolymerization of corresponding vinyl monomers with vinyl acetate into poly(vinyl alcohol) (PVA) with an alkylthio end group. The polymers were investigated as a dispersant for coal‐water slurry (CWM). Anionic groups such as sodium sulfonate and sodium carboxylate enhance remarkably the ability of PVA with an alkylthio end group to disperse coal. Sodium polyacrylic acid with an alkyl end group also showed a good ability of dispersing coal. The order of the ability of dispersing coal in these polymeric dispersants along with sodium napthalene sulfonate formaldehyde condensate (NSF) varied by the kind of coal used. In cases of the polymeric dispersants, the fluidity of coal in terms of dependence of viscosity on shear rate also varied, from dilatency to thixotropy, in accordance with coal used. Impurities in coal as well as surface properties of coal particles might play important roles in the properties of CWM. © 1995 John Wiley & Sons, Inc.