A Complex Based on Imidazole Ionic Liquid and Copolymer of Acrylamide and Phenoxyacetamide Modification for Clay Stabilizer

A complex system (AM/AA/APO-EMIN) was obtained by poly (acrylamide-co-acrylic acid-co-N-allyl-2-phenoxyacetamide) (AM/AA/APO) combining 1-ethyl-3-methyl imidazolium tetrafluoroborate ([EMIM] [BF4]) for clay stabilizer by using acrylamide (AM), acrylic acid (AA) and N-allyl-2-phenoxyacetamide (APO), N-methylimidazole, bromoethane, and sodium fluoroborate as raw materials. The complex solution exhibited excellent anti-swelling rate (up to 94.5% at 10,000 mg/L), satisfying aging resistance (viscosity retention rate 84.2% after 15 days), and marked shear thinning behavior (viscosity retention rate 7.5% under 600 s(-1)). From scanning electron microscope (SEM) images, a clear network structure appeared in AM/AA/APO-EMIM solution. Compared with an existing poly (acrylamide-co-diallyl dimethyl ammonium chloride) clay stabilizer (HY-201S), AM/AA/APO-EMIN was less content and more effective to reduce the d-spacing of sodium montmorillonite (Na-MMT) from 19.1 angstrom to 15.7 angstrom. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41536.