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Modified carrageenan. 4. Synthesis and swelling behavior of crosslinked κC‐ g ‐AMPS superabsorbent hydrogel with antisalt and pH‐responsiveness properties
Author(s) -
Pourjavadi A.,
Hosseinzadeh H.,
Mazidi R.
Publication year - 2005
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.22162
Subject(s) - swelling , self healing hydrogels , ammonium persulfate , copolymer , polymer chemistry , monomer , aqueous solution , swelling capacity , chemistry , chemical engineering , biopolymer , acrylic acid , materials science , fourier transform infrared spectroscopy , nuclear chemistry , organic chemistry , polymer , composite material , engineering
Abstract To synthesize a novel biopolymer‐based superabsorbent hydrogel, 2‐acrylamido‐2‐methylpropanesulfonic acid (AMPS) was grafted onto kappa‐carrageenan (κC) backbones. The graft copolymerization reaction was carried out in a homogeneous medium and in the presence of ammonium persulfate (APS) as an initiator, N , N , N ′, N ′‐tetramethyl ethylenediamine (TMEDA) as an accelerator, and N , N ′‐methylene bisacrylamide (MBA) as a crosslinker. A proposed mechanism for κC‐ g ‐AMPS formation was suggested and the hydrogel structure was confirmed using FTIR spectroscopy. The affecting variables on swelling capacity, i.e., the initiator, the crosslinker, and the monomer concentration, as well as reaction temperature, were systematically optimized. The swelling measurements of the hydrogels were conducted in aqueous solutions of LiCl, NaCl, KCl, MgCl 2 , CaCl 2 , SrCl 2 , BaCl 2 , and AlCl 3 . Due to the high swelling capacity in salt solutions, the hydrogels may be referred to as antisalt superabsorbents. The swelling of superabsorbing hydrogels was measured in solutions with pH ranging 1 to 13. The κC‐ g ‐AMPS hydrogel exhibited a pH‐responsiveness character so that a swelling–deswelling pulsatile behavior was recorded at pH 2 and 8. The overall activation energy for the graft copolymerization reaction was found to be 14.6 kJ/mol. The swelling kinetics of the hydrogels was preliminarily investigated as well. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 255–263, 2005