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In Situ Preparation of Acrylamide-Styrene- Maleic Anhydride Nano Hydrogels and Investigation of their Properties

Lalehgani, Zahra | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50311 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramazani Saadatabadi, Ahmad
  7. Abstract:
  8. Among the methods for increasing chemical oil extraction,the polymeric flood method has the most commercialization capability.However,most commonly used polymers such as Hydrolyzed Polyacrylamide (HPAM) are not able to withstand high levels of salinity and high temperatures.To overcome these problems,in this project,new types of polymer nanostructures were synthesized with hydrophobic groups consisting of styrene (hydrophilic monomer) and malic anhydride (hydrophilic monomer) acrylamide (hydrophilic monomer). These polymers were synthesized by reversible mini-emulsion by adjusting the synthesis conditions for the purpose of producing the terpolymer with suitable conditions for tolerating salinity and high levels of reservoirs,In addition,in this study,copolymers were prepared to produce a terpolymer that,in fact,formed the basis of the corresponding hydrogel formation by introducing changes in the input percentage of monomers in the terpolymer structure without adding any additional binding agent.The chemical structure of the resulting terpolymer and the introduction of hydrophobic monomer into the polymer hydrophilic skeleton were studied by various methods such as TGA ,FT-IR and HNMR. The distribution of nanoparticle size was investigated by scanning electron microscopy¬¬(SEM)¬The rheological behavior of copolymer-polypropylene produced under salinity and high temperature conditions was investigated in comparison with unmodified polyacrylamide. Rheology results suggest that,unlike many commonly used polymers,such as commercial HPAM,which in the presence of one-capacity and bivalent ions lose their efficiency to a large extent,copolymer-based polymer production is not only resistant to these ions,but also by increasing salinity,A dramatic increase in productivity is observed.Increasing the viscosity at a concentration above the critical concentration due to intermolecular interactions between hydrophobic blocks is much more significant. It was also found that an increase in the concentration of tinchic anhydride up to about 5 mol% led to an increase in inflation and the ability to produce hydrogels,While less than this,the solubility was found in salt and water
  9. Keywords:
  10. Polymer Flooding ; Hydrophobically Modified Polymers (HMPs) ; Enhanced Oil Recovery ; Hydrophobicity ; Nanohydrogel ; Minimizing Emulsion ; Terpolymers

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