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Fabrication and properties of superabsorbent complex gel beads composed of hydrolyzed polyacrylamide and chitosan
Author(s) -
Cao Jie,
Tan Yebang,
Che Yuju,
Ma Qiang
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.31796
Subject(s) - chitosan , swelling , polyacrylamide , thermogravimetric analysis , polyelectrolyte , hydrolysis , fourier transform infrared spectroscopy , materials science , chemical engineering , scanning electron microscope , polymer chemistry , nuclear chemistry , chemistry , chromatography , polymer , composite material , organic chemistry , engineering
A novel method for preparing complex beads composed of hydrolyzed polyacrylamide (HPAM) and chitosan, based on the electrostatic attraction between COO − of HPAM and Al 3+ and between COO − and NH 3 + of chitosan, was established. In the two‐stage crosslinking process, first Al 3+ was used as a crosslinking agent for the crosslinking of HPAM molecules, which were used as the skeleton structure of the gel beads. In the second stage, chitosan diffused into the skeleton structure. The gel beads were characterized with scanning electron microscopy, inductively coupled plasma mass spectrometry, Fourier transform infrared spectroscopy, and thermogravimetric analysis. There was a chitosan component in the gel beads, and these gel beads had porous and rough surfaces. The swelling properties of the HPAM–chitosan gel beads were measured in water, in acidic, neutral, and alkaline buffers, and in different saline solutions. The swelling ratio was as high as 3675 g/g in water and 170 g/g in a 0.15 mol/L NaCl solution. The beads showed pH sensitivity in buffers of different pH values and salt sensitivity in different saline solutions. The order of the equilibrium absorbency of the gel beads in different saline solutions was Na + > K + > Mg 2+ > Ca 2+ > Al 3+ . © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010