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Synthesis and properties of poly(sodium acrylate‐co‐2‐acryloylamino‐2‐methyl‐1‐propanesulfonic acid)/attapulgite as a salt‐resistant superabsorbent composite
Author(s) -
Qi Xiaohua,
Liu Mingzhu,
Zhang Fen,
Chen Zhenbin
Publication year - 2009
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21238
Subject(s) - acrylic acid , copolymer , materials science , methyl acrylate , aqueous solution , sodium , swelling , salt (chemistry) , composite number , polymer chemistry , nuclear chemistry , dispersion (optics) , chemical engineering , chemistry , composite material , polymer , organic chemistry , metallurgy , engineering , physics , optics
A novel salt‐resistant superabsorbent composite was prepared by copolymerization of partially neutralized acrylic acid, 2‐acryloylamino‐2‐methyl‐1‐propanesulfonic acid (AMPS) and attapulgite (APT). To enhance the swelling rate (SR) of the copolymer, sodium bicarbonate was used as a foaming agent in the course of copolymerization. Furthermore, for improving the properties of swollen hydrogel, such as strength, resilience and dispersion, the copolymer was surface‐crosslinked with glycerine and sodium silicate, and then the surface‐crosslinked copolymer was blended with aluminum sulfate and sodium carbonate in post treatment process. The influences of some reaction conditions, such as amount of AMPS, APT, and initiator, and neutralization degree of acrylic acid on water absorbency in 0.9 wt% NaCl aqueous solution both under atmospheric pressure (WA) and load (WA P , P ≈ 2 × 10 3 Pa) were investigated. In addition, the effect of them on SR was also studied. The WA and WA P of the superabsorbent composite prepared under optimal conditions in 0.9 wt% NaCl aqueous solution were 52 g·g −1 and 8 g·g −1 , respectively. Besides, the SR was fast, and it could reach 0.393 mL·(g·s) −1 . Moreover, the swollen hydrogel possessed excellent salt resistance, hydrogel resilience and dispersion. POLYM. ENG. SCI., 2009. © 2008 Society of Plastics Engineers