Preparation of poly(AA‐AM) water superabsorbent by inverse microemulsion polymerization

Abstract

A copolymer superabsorbent was prepared by inverse microemulsion polymerization, using cyclohexane as the continuous phase, water as the dispersed phase, N,N-methylene bisacrylamide as the crosslinking agent, ammonium persulfate (APS) as the initiator and OP-10 and SDS as complex surfactants. The synthetic variables (amount of crosslinking agent and initiator, water/oil ratio, monomer/surfactant ratio, and AA/AM ratio), and their effects on the absorbencies of the synthesized superabsorbents were studied. The relationships between the water absorbency and absorption time as well as the water retention capacity of the water superabsorbent were studied. The experimental results of superabsorbent polymers (SAPs) showed the maximum water absorbency of 1432 g/g, and the water absorbency of 722 g/g within 15 min. The water retention in the soil was greatly enhanced using the above superabsorbents. SEM indicated an irregular, undulant, and microporous surface of the superabsorbent, which was convenient for the penetration of water into the polymeric network. SAPs can be considered for watermanaging materials for agriculture and horticulture purposes in desert and drought-prone areas.

Synthesis and swelling properties of a pH‐ and temperature‐dual responsive hydrogel by inverse microemulsion polymerization

“…On the basis of our previous research on superabsorbent hydrogels and microemulsion polymerization, in this article, a new pH‐ and temperature‐dual responsive hydrogel was prepared by inverse microemulsion polymerization, using itonic acid (IA) as pH‐responsive monomer, N ‐isopropylacrylamide (NIPAM) as thermo‐responsive monomer and acrylamide (AM) as the nonionic hydrophilic monomer. Possible mechanism of the dual responsive hydrogels formation was discussed.…”

Rheological behaviors and secondary networks of polyacrylamide hydrogel filled with silica

“…Super absorbent polymers (SAPs) are three-dimensional crosslinked networks of hydrophilic functional groups of polyelectrolytes; they can absorb a large amount of water that is much heavier than their masses because of their ionic nature and interconnected structural features (Buchholz 1996;Wan et al 2008;Chen et al 2010). Due to this unique characteristic, SAPs have been extensively used in many fields, such as personal care products, agriculture and horticulture, bioengineering, pharmaceutical, drug-delivery systems, food industry, enhanced oil recovery and other advanced technologies (Hua and Wang 2009;Lokhande and Varadarajan 1992;Raju et al 2003Raju et al , 2004Guo et al 2005;Liang et al 2007;Sakiyama et al 1993;Shiga et al 1992;Yoshida et al 1989;Hassan and Peppas 2000;Zohuriaan-Mehr et al 2010;Pourjavadi and Kurdtabar 2010).…”

Synthesis of wheat straw composite superabsorbent

“…On the basis of our previous research on superabsorbent and superabsorbent composite, in this article, WS was first modified by maleic anhydride (MAH), and then a novel WS composite superabsorbent was synthesized by redox polymerization in AA and AM aqueous solutions with modified WS used as an organic additive. Effects of reaction time, reaction temperature, and the amount of MAH on the degree of carboxylation were investigated.…”