Fast‐swelling oxidized starch phosphate–poly(acrylate/acrylamide/2‐acryloylamino‐2‐methyl‐1‐propanesulfonic acid) superabsorbent composite

Abstract

A fast-swelling superabsorbent composite was prepared by solution polymerization of acrylate, acrylamide, 2-acryloylamino-2-methyl-1-propanesulfonic acid and oxidized starch phosphate. Ethanol, propyl alcohol, butyl alcohol, and sodium bicarbonate were used as foaming agents to produce fast-swelling characteristics. The structure of the superabsorbent composite was characterized using Fourier transform infrared spectroscopy (FTIR). The influences of the amount of water, acrylamide, 2-acryloylamino-2-methyl-1-propanesulfonic acid, oxidized starch phosphate, initiator, and trihydroxymethyl propane glycidol ether, as well as the neutralization degree of acrylic acid on the equilibrium swelling degree and swelling rate of the superabsorbent composite, were investigated. The equilibrium swelling degree of the superabsorbent composite prepared in a 0.9 wt% NaCl aqueous solution was 52 g g 21, and the swelling rate reached 0.86 mL g 21 s 21. The swelling kinetics was also investigated, and the results indicate that swelling of the superabsorbent composites obeys Schott's pseudo second-order kinetics model. POLYM. ENG. SCI., 00:000-000, 2016.

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“…Many substances have been loaded into the polymer matrix, such as cellulose (Yoshimura et al 2006;Chang et al 2010), starch (Pourjavadi et al 2010;Zou et al 2012), chitosan (Mahdavinia et al 2004;Zhang et al 2007), and complex substances (Perez and Francois 2016;Qi et al 2016) because of their biodegradability, abundance, low generation costs, and multifunctional character.…”