1H NMR,Rheology, and Bottle Testing of HPAm/Cr(III) Acetate Micro Gels |
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| Authors: | S M Vargas-Vasquez L B Romero-Zerón B MacMillan |
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| Affiliation: | 1. University of New Brunswick, Department of Chemical Engineering , Fredericton , New Brunswick , Canada;2. University of New Brunswick, Department of Physics , Fredericton , New Brunswick , Canada |
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| Abstract: | Abstract Solutions formulated at 40°C with partly hydrolyzed polyacrylamide (HPAm) and Cr(III) acetate 50% active were monitored for 240 hr using 1H nuclear magnetic resonance (1H NMR). The HPAm concentration was kept constant at 2,500 mg/L (which is slightly below the critical polymer concentration) and the HPAm to Cr(III) acetate weight ratio ranged from 5:1 to 60:1. Changes in the 1H NMR transverse relaxation (T 2) of the solutions were dominated by the chemistry of Cr(III) acetate. 1H NMR detected changes immediately after HPAm started reacting with Cr(III) acetate. These changes were undetectable by rheology or bottle testing of the studied solutions. |
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| Keywords: | 1H NMR CDG Cr(III) acetate HPAm polyacrylamide gels |
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