synthesis and characterization of hydrogel nanocomposites based on (n- isopropyl acryl amide– acrylic acid)/ ldh

In this research, a novel hydrogel nanocomposites was developed by combining of n-isopropyl acryl amide, acrylic acid, as monomer, and different amounts (1, 3 and 5 wt.%) of unmodified and modified layered double hydroxide (ldh) in condition of room temperature. first, ldh was prepared via reaction of magnesium nitrate and aluminum nitrate. then, ldh modified by using sodium dodecyl benzene sulfate. the measurement of swelling rate indicated that the absorption capacity of hydrogel had inverse relationship with the increase of ldh nanoparticles so that with the increase ldh/hydrogel ratio, water absorbs of hydrogel reduced. scanning electron microscopy (sem) revealed the continuous presence of nanoparticles in the hydrogel nanocomposite. structural confirmation was achieved through fourier-transform infrared spectroscopy (ft-ir), x-ray diffraction, and thermogravimetric analysis (tga).