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Novel Nanoporous Superabsorbent Hydrogel Based on Poly(acrylic acid) Grafted onto Salep: Synthesis and Swelling Behavior
Author(s) -
Pourjavadi Ali,
Soleyman Rouhollah,
Barajee Ghasem Rezanejade
Publication year - 2008
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.200700706
Subject(s) - ammonium persulfate , self healing hydrogels , acrylic acid , swelling , fourier transform infrared spectroscopy , materials science , chemical engineering , superabsorbent polymer , nanoporous , scanning electron microscope , polymer chemistry , solvent , swelling capacity , absorption of water , nuclear chemistry , copolymer , chemistry , composite material , polymerization , organic chemistry , nanotechnology , polymer , engineering
Hydrogels of poly(acrylic acid) grafted onto salep with excellent water absorption and water retention abilities under neutral conditions were successfully synthesized for the first time and employed for different applications. The effect of reaction variables to achieve maximum swelling capacity was investigated. In our procedure, ammonium persulfate (APS) as a water‐soluble initiator and methylenebisacrylamide (MBA) as a suitable crosslinking agent were used and the best synthesis conditions described. The structure of the final product was confirmed by Fourier‐transform infrared (FTIR) spectroscopy, scanning electron microscopy SEM and TGA analysis and a mechanism for superabsorbent hydrogel formation was also suggested. The study of the surface morphology of hydrogels using SEM showed a highly nanoporous and cellular structure for the sample obtained under optimized condition. Furthermore, several factors which influence the water uptake of hydrogels, such as pH of water, sensitivity to salt solutions and solvent mixtures were examined.