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Abstract

In this work, a type of organic-inorganic hybrid hydrogel as water shutoff agent based on 2-acrylamide-2-methylpropanesulfonic acid (AMPS), acrylamide and calcium bentonite (CB) was prepared with free radical solution polymerization using ammonium persulfate/ sodium bisulfate as a redox initiating pair and N,N'-methylene-bisacrylamide (MBA) as a cross-linker. The hydrogels were characterized by Fourier transform infrared spectroscopy, X-ray diffractometry, scanning electron microscopy and thermogravimetry analysis. The results showed that monomers AMPS and acrylamide had polymerized and formed stable network structure and calcium bentonite particles dispersed in it. Effects of calcium bentonite amount, initiator dosage, monomers ratio, polymerization temperature and cross-linker dosage on the swelling properties of the samples were investigated. Water absorption rate, compressive strength and thermal stability of the hydrogels were also investigated.

Keywords

Water shutoff agent Hydrogel Bentonite Acrylamide 2-Acrylamide- 2-methylpropanesulfonic acid Calcium bentonite

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