Abstract
In this study, a series of chitosan-g-poly(acrylic acid)/vermiculite (CTS-g-PAA/VMT) superabsorbent composites containing VMT, acid-activated, ion-exchanged, and organic modified VMT were synthesized by free-radical graft polymerization in aqueous solution, using N,N’-methylenebisacrylamide as a crosslinker and ammonium persulfate as an initiator. The effects of VMT and modified VMT on equilibrium water absorbency, swelling rate, and swelling behavior in various cationic saline solutions (NaCl, CaCl2, and FeCl 3) and different pH value solution of superabsorbent composites were systematically investigated. FTIR spectroscopy confirmed that acrylic acid had been grafted onto CTS and the -OH groups of VMT participated reaction. The introduction of acid-activated, ion-exchanged, and organic modified VMT into chitosan-g-poly(acrylic acid) polymeric network could improve water absorbency and swelling rate compared with that of VMT. The water-absorbing capacity of superabsorbent composites decrease gradually with the increasing of the concentration of NaCl, CaCl2, and FeCl3 solutions from 0.01 to 10 mM. The all prepared samples have similar swelling behavior in different pH value solution and the equilibrium water absorbencies of samples keep roughly constant in the pH range from 4 to 12.
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