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Disposable diapers use poly(sodium acrylate). Polyacrylamide also absorbs a lot of water, but I don't think they use it in diapers. It is used for polyacrylamide gel electrophoresis (PAGE) though.
Poly(methyl acrylate) does not absorb significant amounts of water, and is not used in diapers. —Preceding unsigned comment added by 128.59.150.148 (talk) 17:52, 4 November 2008 (UTC)