Synthesis of wheat straw-g-poly(acrylic acid) superabsorbent composites and release of urea from it

By Rui Liang, Hongbo Yuan, Guoxi Xi, Qingxiang Zhou. 2009

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Meticulous Overview on the Controlled Release Fertilizers (2014, background): “Apt superabsorbent composites by graft copolymerization reaction of acrylic acid (AA) and acrylamide (Am) on attapulgite micropowder using N, N-methylene bisacrylamide (MBA) as a crosslinker, and ammonium persulphate (APS) as an initiator in an aqueous solution are reported by the author.”
Advances in cellulose-based superabsorbent hydrogels (2015, background): “[41] adapted the wheat straw to finish the fabrication of superabsorbent hydrogels.”
Polymer Hydrogels: A Review (2011, background): “They are reported it as loosely cross-linked hydrophilic polymers that can swell, absorb and retain a large volume of water or other biological fluids [ 2-5 ] , and also the absorbed fluid is hardly removed under some pressure [ 6 ] .”
Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review (2015, methodology): “…applied in slow-release of nitrogen fertilizer [135]; (vii) wheat straw-g-poly(acrylic acid) superabsorbent composites for controlled urea release [206]; (viii) a series of hydrogels composed of polyacrylamide, methylcellulose, and calcic montmorillonite for the controlled fertilizer release…”