Journal
POLYMERS
Volume 7, Issue 11, Pages 2431-2445Publisher
MDPI AG
DOI: 10.3390/polym7111522
Keywords
corn straw; sulfonated cellulose; superabsorbent hydrogel; acrylic acid; water absorption
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Funding
- National Natural Science Foundation of China [51304027]
- China Postdoctoral Science Foundation [2014M560567, 2015T80730]
- Shandong Province Science and Technology Development Plan Item [2014GSF120012]
- State Key Program of Coal Joint Funds of National Natural Science Foundation of China [51134020, U1261205]
- National Security State Administration of Work Safety
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In this study, the corn straw after removing the lignin was grafted with 2-acrylamido-2-methylpropanesulfonic acid (AMPS) to prepare sulfonated cellulose. The grafting copolymerization between the sulfonated cellulose and acrylic acid (AA) was performed using potassium persulfate and N,N-methylenebisacrylamide as the initiator and crosslinking agent, respectively, to prepare corn straw-co-AMPS-co-AA hydrogels. The structure and properties of the resulting hydrogels were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and dynamic rheometry. The effects of initiator, crosslinker, monomer neutralization degree, and temperature on the swelling ratio of the hydrogels were studied. The water retention, salt resistance, and recyclability of the corn straw-co-AMPS-co-AA hydrogels were also investigated. The optimum water absorptivity of the corn straw hydrogels was obtained at a polymerization temperature of 50 degrees C with 1.2% crosslinker, 1:7 ratio of the pretreated corn straw and AA, 2% initiator, and 50% neutralized AA.
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