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Superabsorbent composite. XIII. Effects of Al 3+ ‐attapulgite on hydrogel strength and swelling behaviors of poly(acrylic acid)/Al 3+ ‐attapulgite superabsorbent composites
Author(s) -
Zhang Junping,
Zhao Yaogang,
Wang Aiqin
Publication year - 2007
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.20733
Subject(s) - ammonium persulfate , swelling , materials science , acrylic acid , composite number , aqueous solution , composite material , swelling capacity , chemical engineering , superabsorbent polymer , polymer chemistry , copolymer , chemistry , polymer , polymerization , organic chemistry , engineering
Al 3+ ‐attapulgite (Al 3+ ‐APT) was prepared by treating attapulgite (APT) with AlCl 3 aqueous solution of various concentrations. The poly(acrylic acid)/Al 3+ ‐attapulgite (PAA/Al 3+ ‐APT) superabsorbent composite was prepared by reaction of partly neutralized acrylic acid, and Al 3+ ‐APT in aqueous solution using N , N ′‐methylenebisacrylamide as a crosslinker and ammonium persulfate as an initiator. The surface morphology of the composite was investigated by SEM, and the Al 3+ ‐APT composite generated a relatively planar surface comparing the nature APT. The effects of Al 3+ ‐APT on hydrogel strength and swelling behaviors, such as equilibrium water absorbency, swelling rate, and reswelling capability, of the superabsorbent composites were also studied. The hydrogel strength and reswelling capability were improved, however, the equilibrium water absorbency and swelling rate decreased with increasing AlCl 3 solution concentration. The equilibrium water absorbency firstly increased, and then decreased with increasing Al 3+ ‐APT content. The results indicate that Al 3+ ‐APT acts as an assistant crosslinker in the polymeric network, which has great influences on hydrogel strength and swelling behaviors of the PAA/Al 3+ ‐APT superabsorbent composites. POLYM. ENG. SCI., 47:619–624, 2007. © 2007 Society of Plastics Engineers.