Abstract
Novel superabsorbent composites based on sodium alginate-graft-acrylic acid (SA-g-AA) and Na+rectorite (Na+REC), i.e., SA-g-AA/Na+REC, were developed. The effect of the preparative conditions on the absorption of water was investigated. The structure and morphology were analyzed by infrared spectroscopy, X-ray diffraction, transmission electron microscopy and scanning electron microscopy. The results revealed that the optimal condition was 10, 0.8, and 0.03 wt% of SA/Na+REC, potassium persulphate and MBA, respectively. The absorbency of SA-g-AA/Na+REC was 641 g/g for water, or 115 g/g for 0.9 % NaCl solution. Compared to SA-g-PAA, the absorption of SA-g-AA/Na+REC composites in water and many water/inorganic salt solutions increased greatly. In addition, the thermal stability of the SA-g-AA/Na+REC composites improved, which indicated that the participation of Na+REC improved not only the equilibrium water absorbency, swelling rate and salt-resistant properties, but also the thermal stability of SA-g-AA.
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