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Synthesis, characterization, and swelling behavior of superabsorbent hydrogel from sodium salt of partially carboxymethylated tamarind kernel powder‐ g ‐PAN
Author(s) -
Trivedi Jignesh H.
Publication year - 2013
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.38910
Subject(s) - swelling , copolymer , acrylonitrile , polymer chemistry , hydrolysis , swelling capacity , polyacrylonitrile , materials science , salt (chemistry) , nuclear chemistry , grafting , chemistry , composite material , organic chemistry , polymer
Polyacrylonitrile (PAN)‐grafted sodium salt of partially carboxymethylated tamarind kernel powder (Na‐PCMTKP‐ g ‐PAN, %G = 413.76 and %GE = 96.48) was prepared using the established optimal reaction conditions for ceric‐initiated graft copolymerization of acrylonitrile onto Na‐PCMTKP ( DS = 0.15) in a homogeneous medium. The graft copolymer was hydrolyzed by 0.7 N KOH solution at 90–95°C to yield the superabsorbent hydrogel H‐Na‐PCMTKP‐ g ‐PAN. The nitrile groups of Na‐PCMTKP‐ g ‐PAN were completely converted into a mixture of hydrophilic carboxamide and carboxylate groups during alkaline hydrolysis, followed by in situ crosslinking of the grafted PAN chains. The products were characterized spectroscopically and morphologically. The swelling behavior of the unreported superabsorbent hydrogel, H‐Na‐PCMTKP‐ g ‐PAN, was studied by carrying out its absorbency measurements in low‐conductivity water, 0.15 M salt (NaCl, CaCl 2 , and AlCl 3 ) solutions, and simulated urine (SU) at different timings. The swelling behavior of the hydrogel in different swelling media followed the second‐order kinetics. The values of the various swelling characteristics were reported. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013