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Fabrication and Evaluation of the Effect of Hydrolysis on Rheological Properties and Thermal Stability of Acrylamide Copolymers Containing Highly Hydrophobic Monomers

Farhadi, Somayeh | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56360 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramazani Saadatabadi, Ahmad
  7. Abstract:
  8. The use of polymers in the EOR process is very common. Most of these polymers are sensitivity to temperature, salt, and the presence of bacteria. Among these materials, hydrolyzed polyacrylamide (HPAM) is the most widely used. Due to the sensitivity of HPAM in harsh conditions like temperature and salinity of the environment, modification of this polymer by hydrophobic groups can be very effective. Hydrophobic-hydrophilic associative polymers have shown unique rheological properties and high thermal stability, which is due to the presence of a small percentage (up to two percent) of hydrophobic monomers in their structure. Despite these excellent properties for acrylamide copolymers containing highly hydrophobic groups, these copolymers have shown less solubility in water compared to other modified polyacrylamides. To overcome this problem, the synthesis of acrylamide-styrene copolymer was first performed in this project. Then it undergoes hydrolysis by secondary modification using a basic catalyst. Copolymer and its hydrolyzed sample were characterized by FTIR, H-NMR, CHN, and TGA tests. Then its rheological properties were evaluated using a rotary rheometer. The results indicate that the hydrolyzed copolymer shows higher viscosity and better resistance to salt. It can be said that the viscosity of the hydrolyzed copolymer compared to the hydrolyzed polyacrylamide has improved by 170%, the elastic properties of the sample have improved by 130%, and the resistance to viscosity reduction in the saline environment has improved by 40%. Also, the solubility of the hydrolyzed sample of this copolymer is improved by at least 30% depending on the degree of hydrolysis
  9. Keywords:
  10. Styrene ; Acrylamide Copolymer ; Amphiphilic Copolymer ; Rheological Properties ; Polyacrylamid ; Hydrolyzed Polyacrylamide ; Associative Copolymers

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