Preparation, Characterization and Swelling Behaviors of Poly (acrylic acid)/Pillared Montmorillonite K10 Superabsorbent Composites

Content Provider	Semantic Scholar
Author	Seki, Yoldas Yurdakoç, Kadir
Copyright Year	2014
Abstract	Pillared clay based superabsorbents (PILC-SA) were synthesized by using Al pillaredmontmorillonite K10 (Al-K10) via graft copolymerization reaction of acrylic acid (AA). Superabsorbent hydrogels are a type of loosely crosslinked hydrophilic polymer that can swell, absorb and retain a large volume of water or other biological fluid. Superabsorbents may have found many application fields owing to the water absorbing characteristics. Additionally superabsorbents have negative features because of high production cost and low gel strength. To overcome these negative points, inorganic fillers can be used as low cost material and improve the strength properties in the polymer matrixes. For that reason pillared clay might be used as inorganic filler. Swelling behavior of pillared clay based superabsorbent film in distilled water and different pH values were investigated at room temperature. Al-K10 based superabsorbents (Al-K10-SA) reached equilibrium within 100 min. The percentages of equilibrium swelling values were at about at about 5700. The swelling behavior seemed to be pH dependent. It was very essential for new application fields for example drug delivery at human system. Shrinkage was occurred at low pH values and at basic pH condition, the composite showed swelling behavior. Reversible swell-shrink properties were revealed by using buffer solutions at different pH values. The product was characterized by SEM, FTIR and XRD. Characterization methods supported the swelling behavior of composites. SEM images indicated that the homogeny dispersion of Al-K10 was high on the composite and the pores were observed clearly from the morphology of Al-K10. IR characteristic bands of clay were observed in pillared clays and the network of Al-K10SA. It was understood that the clay layer structure remain unaffected by polymerization. The shifts seen of stretching vibrations of SiO2 tetrahedra and OH bands supported ester formation between acrylic network and pillared clay. The XRD results indicated that the peaks assigned to the 001 lattice spacing of montmorillonite were not observed. Pillared clays could not protect the layered silicate structure upon fabricating composites with graft copolymerization of acrylic acid.
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Resource Type	Article