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Use of methanol as a precipitant to isolate saponified starch‐ g ‐polyacrylonitrile from an aqueous alkaline saponification mixture gives a product with a higher water absorbency and better storage stability than that from precipitation with either ethanol, acetone, or isopropanol. Storage stability of the material is strongly dependent on moisture content of the polymer and is enhanced if excess alkali is neutralized before the product is isolated. Absorbent polymers prepared from flour suffer a greater absorbency loss on storage than starch‐based polymers. Storage stabilities of drum dried‐, freeze dried‐, and tray dried products are also examined.
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Fanta et al. (1982) studied this question.
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