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- Title
Kaolin-Enhanced Superabsorbent Composites: Synthesis, Characterization and Swelling Behaviors.
- Authors
Chen, Mengna; Chen, Xuelong; Zhang, Caiyan; Cui, Baozheng; Li, Zewen; Zhao, Dongyu; Wang, Zhe
- Abstract
One type of low-cost and eco-friendly organic‒inorganic superabsorbent composite (SAPC) was synthesized by free radical polymerization of acrylic acid (AA), starch (ST), sodium alginate (SA) and kaolin (KL) in aqueous solution. The structure and morphology of the SAPC were characterized by Fourier transform infrared spectrometer (FT-IR), scanning electron microscope (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The influence of different reaction conditions on water absorption of SAPC, i.e., SA and KL contents, AA neutralization degree (ND), potassium persulfate (KPS) and N, N′-methylenebisacrylamide (MBA) loading were systematically studied. Under the optimal synthesis conditions, very high water absorption of 1200 g/g was achieved. The swelling kinetic mechanism of SAPC was studied by pseudo-second order swelling kinetics model and Ritger‒Peppas model. The performances of SAPC under different environments were tested and results revealed that this new SAPC had excellent swelling capacity, high water retention, good salt tolerance in monovalent salt solution (NaCl solution) and good pH tolerance between 4 and 10.
- Subjects
SUPERABSORBENT polymers; FOURIER transform spectrometers; SCANNING electron microscopes; ACRYLIC acid; SOLUTION (Chemistry); SODIUM alginate
- Publication
Polymers (20734360), 2021, Vol 13, Issue 8, p1204
- ISSN
2073-4360
- Publication type
Article
- DOI
10.3390/polym13081204