Synthesis and Properties of Nanocomposite Superabsorbents Containing Intercalated Hydrotalcite

摘要

The hydrotalcite (HT) synthesized with urea method was used to prepare intercalated HT (SMAS-HT) using methyl allyl sulfonate (SMAS) as an intercalation agent. A novel superabsorbent composite, poly (acrylic-co-acrylamide)/SMAS-HT nanocomposite superabsorbent was prepared by in-situ polymerization, using N, N’-methylenebisacrylamide (NMBA) as a crosslinking agent and ammonium persulfate (APS) as an initiator. The structure and morphology was characterized by FTIR, XRD, and SEM. The influences of the amount of SMAS-HT on the water (salt) absorbency were investigated. The results showed that the intercalation was successful and the intercalated SMAS-HT incorporated into the composite was completely exfoliated. Adding a small amount of SMAS-HT could effectively improve the water (salt) absorbency of the superabsorbent, but adding excess SMAS-HT could decrease the water (salt) absorbency of the superabsorbent. The superabsorbents acquired their highest water (salt) absorbency when the content of SMAS-HT is 3 wt%. The highest absorbencies of the superabsorbents for deionized water and 0.9% NaCl (aq) were 900 1 g gand 140g g-1 respectively.