Synthesis and characterization of functionalized acrylic‐acrylamide‐based superabsorbent gels

Abstract

ABSTRACT:We have synthesized series of superabsorbent polymers (SAPs) by solution free radical polymerization of acrylic acid (AA), acrylamide (AM) with different functional monomers (FM). Three functional monomers including zwitterionic monomer [3-(methacryloylamino) propyl] dimethyl (3-sulfopropyl) ammonium (MPDSA), cationic monomer (3-acrylamidopropyl) trimethylammonium chloride (APTAC) and anionic monomer 2-acrylamidoglycolic acid monohydrate (AGAM) were selected to provide different charged groups on the superabsorbents. The effect of reaction parameters, such as degree of neutralization, content of initiator and crosslinker on the swelling capacity were assessed. The water absorbency of the superabsorbent were characterized in the distilled water, 0.9 wt % NaCl solution and the mixed solution containing 60 mg L À1 CaCl 2 and 30 mg L À1MgCl 2 , respectively. In addition, the swelling rate and water retention capacity in the soil were also investigated. Finally, the mechanism of different absorbency induced by the variety kinds of functional monomers was studied by XPS and FTIR, and tentative interpretation was presented as well.

Novel itaconic acid‐based superabsorbent polymer with improved gel strength and salt resistance using 2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid

“…The structure of the SAPs in the form of potassium bromide (KBr) pellets was analyzed using Fourier‐transform infrared spectroscopy (FTIR, Nicolet, Thermo Fisher Scientific, United States) in a scan range of 400–4000 cm −1. 14 …”

CO2-responsive gels

“…158,160 If the polymer formed is soluble, a macrogel will form instead as there is little control over the particle size. 161,162…”

Synthesis and Properties of Konjac Glucomannan‐graft‐poly(acrylic acid‐co‐trimethylallyl ammonium chloride) as a Novel Polyampholytic Superabsorbent

“…Superabsorbent polymers (SAPs) are a kind of functional polymers that have the ability to absorb a considerable amount of water or other liquids (tens to thousands of times of its own weight) in a relatively short time 1,2. Generally, SAPs are partially neutralized, lightly cross‐linked, three‐dimensional polymer networks that expand during the water absorption process.…”