Preparation and Characterization of Thermosensitive Interpenetrating Double-Network Hydrogel/Modified Bentonite Composite Water Absorbent and Retention Material
WANG Yu1,2, ZHAO Jun1, REN Junpeng1, LI Benxiu2,3, ZHOU Jinkang1, LI Xiaoping1
1 School of Chemistry and Materials Science, Guizhou Education University, Guiyang 550018, China 2 Anshun Engineering Research Centre of Concrete Admixture, Anshun 561100, China 3 Guizhou Tiejianhengfa New Material Technology Co. Ltd., Anshun 561100, China
Abstract: Thermosensitive interpenetrating double-network hydrogel/modified bentonite composite water absorbent and retention material was synthesized by modified bentonite, 2-acrylamido-2-methylpropane sulfonic acid, acrylamide, thermosensive macromonomer raw materials and N,N′-methylenebis(acrylamide) as crosslinker through aqueous solution interpenetrating double-network polymerization method. The prepared samples were characterized by X-ray diffraction(XRD), Fourier transform infrared spectrometer(FTIR), thermal gravimetry(TG), field emission scanning electron microscopy(SEM), and differential scanning calorimetric (DSC). The swelling property, temperature sensitivity, deswelling property, oscillatory swelling/deswelling property and tensile strength of the composite water absorbent and retention material were studied. The results show that the absorbancy of the composite water absorbent DNB5 and retention material to deionized water and 0.9% NaCl solution is about 20.59 g/g and 7.92 g/g respectively at 20 ℃. The LCST, equilibrium swelling ratio and tensile strength of the composite water absorbent and retention material are enhanced with the increase in dosage of modified bentonite or AM of second-network. It can find that the composite water absorbent and retention material possesses good water absorption, water retention, remarkable thermosensitivity, controllable equilibrium swelling/deswelling behavior and higher mechanical property.
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2020, Vol. 34 
