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Superabsorbent composite XXII: Effects of modified sepiolite on water absorbency and swelling behavior of chitosan‐ g ‐poly(acrylic acid)/sepiolite superabsorbent composite
Author(s) -
Xie Yuntao,
Wang Aiqin,
Liu Gang
Publication year - 2010
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.20770
Subject(s) - sepiolite , acrylic acid , ammonium persulfate , materials science , swelling , polymerization , aqueous solution , polymer chemistry , chemical engineering , composite number , solution polymerization , swelling capacity , chitosan , radical polymerization , nuclear chemistry , composite material , chemistry , raw material , organic chemistry , copolymer , polymer , engineering
In this work, a series of chitosan‐ g ‐poly(acrylic acid)/sepiolite (CTS‐ g ‐PAA/ST) superabsorbent composites containing raw sepiolite, acid‐activated sepiolite, and cation‐exchanged sepiolite were synthesized by free‐radical graft polymerization in aqueous solution, using N,N ′‐methylenebisacrylamide as a crosslinker and ammonium persulfate as an initiator. The effects of raw sepiolite, acid‐activated sepiolite, and cation‐exchanged sepoilite on equilibrium water absorbency, swelling rate, and swelling behavior in different pH value solution of superabsorbent composites were systematically investigated. The results from FTIR spectra showed that chitosan and sepiolite participated in graft polymerization reaction with acrylic acid. The introduction of acid‐activated and cation‐exchanged sepiolite into chitosan‐ g ‐poly(acrylic acid) polymeric network could improve water absorbency and swelling rate compared with that of the raw sepiolite. All prepared samples have similar swelling behavior in different pH solutions and the equilibrium water absorbencies of samples keep roughly constant in the pH range from 4 to 12. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers