Modified chitosan 4. Superabsorbent hydrogels from poly(acrylic acid-co-acrylamide) grafted chitosan with salt- and pH-responsiveness properties

By G. Mahdavinia, A. Pourjavadi, Hossein Hosseinzadeh, M. J. Zohuriaan. 2004

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Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review (2015, background): “The production of SH based on chitosan has signiﬁcantly increased in recent years [74–77].”
Fundamental Concepts of Hydrogels: Synthesis, Properties, and Their Applications (2020, result): “This study was in good agreement with a previous one [90].”
A Brief Review of Stimulus-active Polymers Responsive to Thermal, Light, Magnetic, Electric, and Water/Solvent Stimuli (2010, background): “A typical example of pH-active hydrogel is a polyacrylic acid system (Mahdavinia et al., 2004).”
Superabsorbent polymers in agriculture and other applications: a review (2019, background): “These hydrogels are sensitive to various stimuli such as temperature([15,119]), pH([37,120,121]), magnetic field([122]), and electric field.”
Polymer in Agriculture: a Review (2008, background): “In recent years, superabsorbent polymers prepared from natural polymers such as starch([85]), chitosan([86]), a high molecular weight polysaccharide from chitin, and poly(amino acid)s([87]) have received increasing interest because they are environmentally friendly, biodegradable, and independent of”