Loading...

Synthesis and characterization of highly hydrophilic self-associating terpolymers: Rheological, thermal, and corrosion protection studies

Ghaderi, S ; Sharif University of Technology | 2021

668 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.cej.2020.126939
  3. Publisher: Elsevier B.V , 2021
  4. Abstract:
  5. In this study, water-soluble terpolymers containing highly hydrophilic monomers of acrylamide and maleic anhydride and highly hydrophobic monomers of styrene were synthesized (ASM) through the one-step inverse emulsion polymerization. Proton nuclear magnetic resonance (1H NMR), fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction pattern (XRD) were performed to investigate the chemical structures and structural transformations of ASM. Thermal stability and thermal decomposition steps of ASM were studied by thermogravimetric analysis (TGA). An Ubbelhode capillary viscometer and a rheological mechanical spectrometer (RMS) were employed to obtain the specific, relative, and intrinsic viscosities and rheological properties of ASM solutions at different temperatures and in the presence of different concentrations of salts. Gel permeation chromatography (GPC) test and the capillary viscometry method were utilized to obtain the molecular weight of ASM chains. The obtained results showed that the shear viscosity of ASM solutions increased by the increment of the temperature and salts’ concentration. Long-term thermal stability of the ASM solutions was assessed by an aging test in which long-lasting exposure endurance attained and the shear viscosity increased after the thermal aging due to the branching of ASM chains through ring-opening anhydride reactions. Corrosion protection properties of mild steel samples immersed in terpolymer solutions before and after aging at 150 °C were studied via the electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests. Corrosion protection properties of solutions were enhanced after the thermal aging. The inhibition efficiency of ASM and thermally aged ASM (A/ASM) were obtained ~52% and ~94%, respectively. © 2020 Elsevier B.V
  6. Keywords:
  7. Acrylic monomers ; Amides ; Decomposition ; Electrochemical corrosion ; Electrochemical impedance spectroscopy ; Emulsification ; Emulsion polymerization ; Fourier transform infrared spectroscopy ; Gel permeation chromatography ; Hydrophilicity ; Inverse problems ; Nuclear magnetic resonance ; Nuclear magnetic resonance spectroscopy ; Salts ; Shear viscosity ; Spectrometers ; Steel corrosion ; Styrene ; Terpolymers ; Testing ; Thermal aging ; Thermodynamic stability ; Thermogravimetric analysis ; Viscosity measurement ; Fourier transform infra red (FTIR) spectroscopy ; Gel permeation chromatography (GPC) ; Inverse emulsion polymerization ; Potentiodynamic polarization tests ; Properties of solutions ; Proton nuclear magnetic resonance ; Structural transformation ; Synthesis and characterizations ; Corrosion protection
  8. Source: Chemical Engineering Journal ; Volume 405 , 2021 ; 13858947 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1385894720330679