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Synthesis of the copolymer hydrogel κ‐carrageenan‐ graft ‐PAAm: Evaluation of its absorbent and adhesive properties
Author(s) -
Meena Ramavatar,
Prasad Kamalesh,
Mehta Gaurav,
Siddhanta A. K.
Publication year - 2006
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.24703
Subject(s) - copolymer , self healing hydrogels , swelling , potassium persulfate , adhesive , materials science , aqueous solution , acrylamide , polymer chemistry , carrageenan , chemical engineering , nuclear chemistry , composite material , chemistry , polymerization , polymer , organic chemistry , layer (electronics) , engineering , biochemistry
κ‐Carrageenan‐ graft ‐PAAm, a copolymer hydrogel of κ‐carrageenan (kC) and acrylamide (AAm), has been synthesized in aqueous medium at ∼ pH 7 in the presence of the initiator potassium persulfate (KPS), using microwave irradiation. The reaction conditions were optimized by varying the concentration of AAm and KPS to obtain copolymer hydrogels having different nitrogen contents e.g., %N 6.35, 10.56, and 11.05. It was observed that copolymer hydrogel having %N 11.05 gives superior adhesive properties whereas copolymer hydrogel with %N 10.56 produces superior absorbent properties in the presence of optimized concentrations of AAm (0.87 and 1.1428 mol/L respectively) and KPS (0.022 and 0.0296 mol/L respectively). The product with %N 6.35 is a soft gel (2–5% gel in 1% KCl) exhibiting low gel strength (135 g cm −2 ). The one with %N 10.56 showed superior swelling property and maximum swelling was observed in the alkaline pH (22 g/g). The swelling behaviors of the hydrogels were studied at different pHs (pH 1.2–12.5) as well as in 1% aqueous solutions of NaCl, KCl, and CaCl 2 . The 5% dispersion of the hydrogel having %N 11.05 in water had good binding properties with papers, polyethylene sheets, and wood pieces. To evaluate the measure of adhesive property, the viscosity and solid and liquid weights of the applied adhesive were measured. Characterization of the copolymer hydrogels was done by TGA, X‐ray diffraction, 13 C‐NMR, FT‐IR, elemental analyses, and rheological studies. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 5144–5152, 2006