Synthesis and aqueous solution properties of hydrophobically modified graft copolymer of sodium carboxymethylcellulose with acrylamide and dimethyloctyl(2-methacryloxyethyl)ammonium bromide

The hydrophobically modified water-soluble graft copolymer of sodium carbox ymethylcellulose with acrylamide and dimethyloctyl(2-methacryloxyethyl)ammo nium bromide has been synthesized using potassium persulfate and dimethylam inoethyl methacrylate as initiators in aqueous solution. The structure and composition of the graft copolymer were characterized by infrared spectrum and elementary analysis. Molecular weight was determined by gel permeation chromatography. The solubility and viscosity of the graft copolymers in aqu eous solution were investigated, as a function of copolymer concentration, added salt, temperature, shear rate, and surfactant. In addition, the inter molecular hydrophobic association in aqueous solutions in the presence of a dded salt and surfactant was demonstrated through the retention time from g el permeation chromatography measurement. (C) 2000 John Wiley & Sons, Inc.