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Preparation, Characterization and Swelling Behaviors Sodium Alginate-Graft-Acrylic Acid/Na+Rectorite Superabsorbent Composites |
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| Authors: | Juanli Deng Lianli Yang Guozheng Liang Shaobo He |
| Affiliation: | 1. School of Materials Science and Engineering, Chang’an University, Xi’an, 710064, Shaanxi, People’s Republic of China 4. National Key Laboratory of Thermostructure Composite, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, People’s Republic of China 2. College of Chemistry and Chemical Engineering, Xianyang Teachers’ College, Xianyang, 712000, Shaanxi, People’s Republic of China 3. Department of Applied Chemistry, School of Science Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, People’s Republic of China |
| 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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