Preparation and properties of porous poly(sodium acrylate‐co‐acrylamide) salt‐resistant superabsorbent composite

Abstract

A novel semi‐interpenetrating polymer networks (semi‐IPNs) porous salt‐resistant superabsorbent composite was prepared by copolymerization of partially neutralized acrylic acid and acrylamide using polyethylene glycol as semi‐IPNs composite, N,N′‐methylenebisacrylamide, triene propanol phosphate, and trihydroxymethyl propane glycidol ether as crosslinking agents, methanol, propanol, and butanol as foaming agents, and L‐ascorbic acid and peroxide hydrogen as initiators. To improve the properties of swollen hydrogel, such as strength, resilience, permeabilities, and dispersion, the copolymer was surface‐crosslinked, and then blended with aluminum sulfate, sodium carbonate, and sodium 1‐octadecanol phosphate in the course of post treatment. The influences of reaction conditions on properties of superabsorbent composite were investigated and optimized, and the water absorbency of superabsorbent composite prepared at optimal conditions in 0.9 wt% NaCl aqueous solution under atmospheric pressure and certain load (P ≈ 2 × 103 Pa) were 61 g g−1 and 16.7 g g−1, respectively. Moreover, the swelling rate reached 22.003 × 10−3 g (g s)−1. And the excellent hydrogel properties, such as hydrogel strength, resilience, permeabilities, and dispersion were also obtained. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers

Frontal polymerization of superabsorbent nanocomposites based on montmorillonite and polyacrylic acid with enhanced soil properties

“…The water absorption extent under load ( Q p ) of FP4, FP9, and BP4 are shown in Figure . Q p of FP9 was higher than FP4 because the long chains of CMC could physically entangle on SAP network, thus enhances the elasticity of network, which would retain the pore structure effectively . The rigid network of BP4 made its Q p higher than FP4.…”

Fast‐swelling superabsorbent polymers with polymerizable macromolecular surfactant as crosslinker

“…The AUL test procedure in saline (0.9 wt % NaCl) solution was accomplished according to a previous report . The accurately weighed 0.100 g sample was spread uniformly on the surface of polyester gauze which was located on a macro‐porous iron filter plate placed in a Petri dish.…”

High‐temperature resistant superabsorbent based on poly(acrylic acid) with triallylammonium chloride as crosslinking agent

“…The remaining gel was collected and weighed. The water absorbency of the sample ( Q w ) was calculated based on the following equation: where M 1 and M 2 represent the weights of the dried sample and the swollen gel ( g ), respectively.…”