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A semi‐interpenetrating polymer network superabsorbent polymer based on sodium lignosulfonate‐graft‐poly(acrylic acid‐acrylamide)/potassium dihydrogen phosphate and polyvinyl alcohol (PVA/SL‐g‐P[AA‐AM]/KDP) was synthesized by using solution polymerization. The PVA/SL‐g‐P(AA‐AM)/KDP was further hydrolyzed in NaOH solution. The structure, thermal stability, and morphologies of samples were examined...