Swelling Behaviors of Cr³⁺-modified Acrylamide-Based Superabsorbent Polymer Microsphere in Brines

Abstract

Ion-specificity effect between cations existed in aqueous system and hydrophilic polymer gel is a typical limitation and challenge for hydrophilic polymer utilization during tertiary oil recovery. This study presents a novel cation-insensitive microsphere system (M-SAP) which is developed with controllable initial size and stable swelling ratio under varying salinity solvents. Polymerization behaviors were depended on varying concentration of each compounds and the result shows that the microsphere formed via 6.36mM N, N'-methylene bisacrylamide initiated by 0.859mM ammonium persulfate shows most stable structures and possess ideal sphericity (sample #2). Instead of directly crosslinking the polymer as other references, the utilization of sealed chromium cation (Cr3+) as a shield of M-SAP to prevent ion-specificity effect from out-coming cation is reported. The micro-structure of M-SAPs were discussed which helped analyze Cr3+ preserving and shielding mechanism. Cr3+ preserving and shielding mechanism can be interpreted as that Cr3+ helps eliminate the electrostatic repulsions on carboxylate group from out-coming cations.

Department(s)

Geosciences and Geological and Petroleum Engineering

Comments

U.S. Department of Energy, Grant DE-FE0024558

International Standard Book Number (ISBN)

978-151085814-5

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Curran Associates Inc., All rights reserved.

Publication Date

01 Jan 2017

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