A novel protein-based superabsorbent hydrogel was synthesized by graft copolymerization of hydrolyzed cottonseed protein (HCP) and acrylic acid (AA) monomer. This hydrogel was synthesized by solution-based copolymerization, using N,N-methylene bisacrylamide as a crosslinking agent, potassium persulphate and sodium sulfite as the initiators. The effects of the certain variables of the graft copolymerization on the swelling capacity of the hydrogel were measured and its swelling properties in different solutions were investigated as well. This new approach is a promising method in utilizing hydrolyzed cottonseed protein in the production of a superabsorbent polymer with excellent water absorbency and potential use in various applications.
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Zhang et al. (2010) studied this question.
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