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A series of poly(acrylic acid) hydrogels crosslinked by poly(l-glutamic acid)-g-(2-hydroxyl methacrylamide) (PGA-g-HEMA) were synthesized. The hydrogels showed pH-dependent swelling-deswelling behaviors. The hydrogels exhibited lower swelling ratios in an acidic medium because of the protonation of both acrylic acid (AA) and glutamic acid (GA) acid group residues. In contrast, in a basic medium (pH...
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