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The Effect of using Solvent in the Inverse Emulsion Copolymerization of Acrylamide and Comparison of the Results with Copolymers Obtained from Micellar Polymerization

Gholamjani Moghaddam, Soroush | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58296 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramazani Saadatabadi, Ahmad
  7. Abstract:
  8. Viscosifiers or thickeners are responsible for regulating the rheological properties of fluids to control flow and are widely used in various industries. Polyacrylamides modified with hydrophobic groups are among the most important viscosifiers in various industries, which are mainly produced by two methods: inverse emulsion polymerization and micellar polymerization. The aim of this study is to compare the two mentioned polymerization methods for the synthesis of polyacrylamides modified with hydrophobic groups with acrylamide monomers (main monomer), styrene (water-repellent monomer) and maleic anhydride (hydrophilic auxiliary monomer) and also to compare the effect of using two different organic solvents, cyclohexane and toluene, in the inverse emulsion method. The inverse emulsion polymerization method is one of the most suitable methods for producing polymers with suitable properties and an acceptable molecular weight range. At the same time, the temperature at which the reaction begins can be controlled in this process. In the second method, called micellar polymerization, the polymer is synthesized without using any organic solvent, which is more economical. In order to determine the success of the synthesis, FT-IR and H-NMR analyses were performed on terpolymer powder samples, which confirmed the validity of the hypothesis. In the next step, the molecular weight was determined by measuring the intrinsic viscosity of polymer solutions with low concentrations using a Cannon-fenske viscometer, which revealed that the polymer sample obtained by the inverse emulsion method with cyclohexane solvent had the highest molecular weight, and by observing the images obtained from FE-SEM analysis, it had a spherical and relatively more regular structure than the other polymers examined. Finally, by observing the improvement of rheological properties at different temperatures and salt concentrations and observing the stages of thermal degradation in TGA analysis, it was determined that this polymer is superior to inverse emulsion terpolymers with toluene solvent and terpolymer obtained by the micellar method as a viscosifier
  9. Keywords:
  10. Hydrophobically Modified Polymers (HMPs) ; Styrene ; Maleic Anhydride ; Inverse Emulsion Polymerization ; Micellar Polymerization ; Viscosifiers

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