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Low-density cross-linked SAPs generally have a higher absorbent capacity and swell to a larger degree. These types of SAPs also have a softer and stickier gel formation. High cross-link density polymers exhibit lower absorbent capacity and swell, and the gel strength is firmer and can maintain particle shape even under modest pressure.
Over the years, technology has progressed so that there is little if any starch-grafted superabsorbent polymer used in disposable hygienic products. These super absorbents typically are cross-linked acrylic homo-polymers (usually sodium neutralized).
Super-absorbent polymers (SAP) similar to sodium polyacrylate were developed in the 1960s by the U.S. Department of Agriculture. [3] Before the development of these substances, the best water absorbing materials were cellulosic or fiber-based like tissue paper, sponge, cotton, or fluff pulp.
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Potassium polyacrylate works similar to a sponge under the soil surface. It is composed of a set of polymeric chains, which are linked together chemically to become a water-insoluble matrix that gently attracts and holds water molecules.
Parachute. Crafted from 100 percent long-staple Turkish cotton, this towel is built to be lightweight and super absorbent with a weight of 450 GSM.