水解
共聚物
丙烯酸酯
聚电解质
聚丙烯酰胺
摩尔质量
丙烯酰胺
聚合物
高分子化学
化学工程
材料科学
丙烯酸
甲基丙烯酸酯
丙烯酸酯聚合物
流变学
絮凝作用
化学
有机化学
复合材料
工程类
作者
Ruilei Kong,Yeheng Guo,Ian A. Barker,Tia Hamielec,David Hunkeler
摘要
Abstract Polyacrylamide‐co‐sodium acrylate has been prepared via copolymerization of acrylamide and acrylic acid, or the hydrolysis of a pre‐formed nonionic polymer. Both macromolecules had a charge of 24 mol% with a molar mass of 25 million g/mol. While one might expect similar performance, the hydrolyzed materials were superior in rheology modification, while the copolymerized samples worked better as flocculants. This hydrolysis reaction is influenced by the dyad sequence and produced a relatively uniform charge distribution along the backbone. These partially hydrolyzed polyelectrolytes had approximately 40% higher solution viscosities compared to the copolymerized samples. The rheological properties were also more tolerant to temperature, electrolytes, and hardness. Such molecules would be expected to perform well as pushing fluids as used in enhanced oil recovery processes. In contrast, when tested on an inorganic sludge, with a high level of polar and soluble hydrophobic molecules, the copolymerized sample provided larger flocs, a clearer filtrate, and faster settling. The hydrolyzed macromolecules essentially functioned only as a coagulant generating pin flocs. Depending on the application, polymer structure can be tuned by the method of synthesis. To the authors' knowledge, this is the first report comparing the influence of synthesis method on polyacrylamide solution properties and application performance.
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